I sort of feel sad for you. I mean, a trip out west is a trip out west... but CO is having a worse season than even last year. at 64% Breck is hurting pretty damn bad. So your "REAL" mountain experience isn't going to be complete with "REAL" terrain. But I've heard good things about the park set up and every pro in existence is there training right now (unless they went home for the holidays). Regardless, I'm sure you're having fun and it will only peak your interest for a better experience down the road.
As far as the OP goes. I'd like to also recommend the demo. Bring your park skis and if it snows, take out demos. Sometimes you don't get lucky and it's just groomers for a trip, so it would be worth it to still bring your park skis.
Also, I'd call around and check out demo prices. Sometimes the shops are a lot cheaper, but if you want to take out a pair or two in one day, that can be a pain in the ass. Also, different shops cary different brands. So think about the skis you'd want to try and call around and see what shops have what skis. Also check the mountain calendar. Sometimes different companies do on mountain demos and for all you know, there could be a company demoing for free and you just leave your own skis. I got away with this with my sister once. I gave her a pair of skis that didn't fit her and she handed em over and got to take out some icelantics for the day for free.