The deal you make is up to you but Star Trek is an excellent, fast-paced game. I purchased my Pro version in June and have nearly 600 plays on it already. The Premium is that much sweeter to look at.
If you have the chance, I would recommend downloading The Pinball Arcade to your PC and purchasing the Star Trek table for it. The physics aren't perfect in my opinion, but you'll be able to play the game before committing thousands to your purchase.