Forget about rail pass, it's cheaper to buy point-to-point tickets in the countries you mentioned. As you travel outside major cities, you will find it difficult to communicate in English. If you speak Russian or German, you'll be fine.

Personally I would spend more time traveling between the Czech and Slovak republics. Except for Bratislava, which is industrial, the rest of Slovak republic is as green as Switzerland or Vermont. They even have their own Alps--the High Tatras--where the former Cardinal Wojtyla used to ski. The infrastructure (trains, cell phones, highways) in Slovakia is world class. You can eat Goulash every day and still not get tired of eating it since every restaurant prepares it differently.

Bratislava is a like a small citadelle. I find nightlife there better than in Prague since it's not overrun by "publicly and horribly pissed" tourists. However, if you like the hustle and bustle of Amsterdam, then Prague is your city.

If you're ever in Bratislava, take a local river cruise to Devin Castle. Walk or ride a bike (you can rent one in Bratislava) along the banks of the Danube. This was once a no-man's land, for across the river, less than 50 yards, is the Austrian Republic. Before the Velvet Revolution, this section of the Danube was symbolically part of the Iron Curtain. It once separated Eastern Europe from Western Europe.

Although the Czech and Slovak Republics and Hungary are members of the European Union, they're not part of Schengen. So travel to these countries, including Austria, still requires going through passport control.