Ya K2 has been around for a really long time. They started by making skis then started making snowboards a few years back. They actually own Ride snowboards which is probably a company you have heard of second in snowboard world only to Burton. With your type of riding you should definitely check out Lib Tech and Gnu snowboards. This all mountain freestyle riding is their specialty. Look into the Magne traction technology as well. It gives you 7 contact points so that you have way better grip in icy conditions. This tech also helps you in the park because you can file your edges a little more no avoid catching an edge on rails and boxes yet you can still feel safe all over the mountain because of your excess of contact points. Check out the TRS, T Rice, Dark series from Lib and the Street Series, CHB, and the Riders choice from Gnu. I can even give you a link to a site that has killer deals on all boards and more. Good luck man!!
SierraSnowboard.com