Lech had an ok park this year. Flat box, flat-down rail, down rail, c-box, some decent jumps, etc. The skiing there is sick, if you are lucky with the weather and snow, you can get some excellent powder skiing! And the skipass there works in Lech, Zürs and St. Anton. The park in St. Anton is not bad, but I wouldnt say that its better than Lech. I like Lech a lot more than St. Anton. Its more expensive, which sucks, but there are less people and its just got a nicer town and all. So if you can, I would def. go to Lech! Another cool place is Sölden. Its got a nice park, even in the summer. Lots of rails, s-rollercoaster rail, flat rail, flat-down, inverted rainbow, rainbow, c-rail (one of those that goes to the left and right at the same time), boxes, etc. Jumps are not bad too. Montafon/Silvretta nova is pretty good too, but I would rather go to Lech or Sölden. The NovaPark is nice, but still you arent gonna miss the park if you get some nice powder in Lech. Another good ski are is Ischgl, its huge. Havent been there for a few years though, so I cant really say what the park is like though. Check out this site, it gives you info about A LOT of ski areas in Austria:
http://www.bergfex.com/austria/?lang=en 
