I wouldn't go much wider than 100 underfoot. Especially because you are skiing park and not a lot of pow. Wider skis put a much greater amount of force on the screws holding your bindings onto the ski (wider ski = longer lever arm). As a result, as skis have grown wider much faster than binding screw patterns have, more and more bindings are pulling out as wider skis are increasingly used on non-powder conditions.
When you are buying park skis, you get what you pay for in quality. Brands like moment, 4frnt, and on3p are made in the US and have reputations for high quality skis. As previously mentioned, i would recommend that you look into the moment pb&j or the on3p Jeffery/Jmo. all three are fun and high quality skis. If you get a chance to demo, do it, as you are the only one who can determine what you will like best.