I emailed Austrian Rail about the ticket price from Vienna to Prague. Via direct EuroCity train, from Vienna South to Prague Holesovice, the one way 2nd class fare is €43,80. A seat reservation is an additional €3,40.

Dear Redheads,
I have been to all the places in your schedule several times and we just returned from a month in Germany and Austria and the World Cup Soccer matches. I have not read all the replies to your inquiry, but many have stated that you are moving around too much. YES YOU ARE!! Here are a few points:
1) Save Dachau to the end of the trip or not at all. It is a wonderful monument and experience, but it is very "disturbing" and "emotionally draining". Seeing it early in your trip might just "ruin" the next week of the trip. Besides, Dachau is not exactly on the road to Fussen.
2) You have obviously done your homework regarding picking up cars at the airports. CAR RENTAL ARRANGEMENTS SHOULD ALWAYS BE MADE FROM THE USA. Train tickets, on the other hand, should be purchased at the rail station in Europe. The best car rental deal I know of is found at www.gemut.com. We rented from National Car Rental in Frankfurt (in town), used it for 22 days, dropped it off at the Munich airport, and it cost lest than $750. Use your credit card that has insurance coverage included with the card.
3) You're on the GO TOOOOO much! Have you driven the autobahn before? If not, learn the rules of the European road - You may NOT pas another car on the right hand side. You may NOT drive in the left hand lane - it is only for passing and be damn sure you check your rear view mirror before you pull into the passing lane. You may feel that driving at 140 km/hr (~85 mph) is fast until an Audi, BMW, or Mercedes passes you going 150 mph. Know all the international road signs! To get an idea of how to get from place to place with driving directions, the best web site is:
http://www.maporama.com/share/Map.asp?PDT=maposearch
Your schedule doesn't seem to allow for driving time or getting lost. Do any of you speak German? Most Germans speak enough English to help you, but the road signs, towns, etc. are still in German. I read and speak German and I still have a tough time finding my way around. So take everyone's advice - -stay longer in fewer places and take day trips from there.
4) Both Castles? Yes, it is possible, but rather exhausting. Skip going inside Neuschwanstein - long lines and not very interesting -- but do hike or take the horse drawn carriage to Marienbrucke (Mary's Bridge) above the castle for spectacular view and photo op. Then, head for Linderhof. This is the best castle! Best way to get there is to go back through Reutte (pronounced roy-tah)toward Innsbruck, but turn of on a small road that takes you to Plansee (a small lake. Follow the road and eventually the signs to Schloss Linderhof. Taking the tour and seeing the grounds will take about 3 hours total.
The rest of your trip sounds "OK" but "busy".
Salzburg is worth a couple days (go to Cafe Winkler) and the Salzkammergut area is superb. Hallstatt is a walking town in the Summer and you won't be allowed to drive into the city. Must park outside (or maybe down by the old church in town) and parking is scarce. St. Wolfgang is great for lunch. If any time permits ( ya-right) drive to Grossglockner about 1.5 hours from Hallstatt area. This is the highest mountain in Austria and is spectacular!!

Finally, stay longer in each place and you will see more and be more rested!!

BCW

We all have differing interests, but I enjoyed the interior tour of Neuschwanstein. There are 12-15 rooms that were completed and furnished, and it includes some of the finest 19th Century craftwork you'll find anywhere. And the stories behind the choice of decor for the various rooms is very interesting--at least they were to me.

We too really enjoyed taking the tour through Neuschwanstein. I certainly wouldn't skip it, but that's just me.

BCW, I'm surprised you found getting around difficult at times. We found it to be the complete opposite. There were signs everywhere pointing the way to the various towns/cities. We found driving around Bavaria and Austria to be a joy. Just a note to the OP though; we hit road construction in several places on the autobahns and side roads, and this can lock up traffic. Also, note that it can take a long longer to get from point A to point B than you may anticipate. A lot of the roads were very twisty and had slow-moving vehicles on them, making it very difficult to pass. Allot extra time for this.

Good luck!
Tracy

We did and didn't experience difficulties getting around.

Pretty much no trouble getting from one city or town to another. But once arriving in some cities and larger towns, the lack of or difficulty of seeing signs can be a problem (because of space problems, signs are often tacked up anywhere, or nowhere).

BCW--good advice worth heeding. The only minor point I'd make is that Cafe Winkler, which had stood atop the mountain overlooking Salzburg's Altstadt, was torn down a couple of years ago to make way for a museum--unless a successor Cafe Winkler was built. Was it?