I'm 6'4'' 200lbs and ride the 161.5 TRice. It's the smallest board I've owned, but I find that it rides just fine for my size. At your size, a 157 should be fine especially since you won't be riding much deep poweder.
I'm not familiar with the terrain that you'll be ridinig so it's hard to recommend a board, but I bought the Rice for riding bigger steeper lines...espcially when there is powder (that's what I like most). If you don't have big/steep runs and don't have powder very often, you may want something a little more playful. The other suggestions already mentioned are pretty good. If you really want something like the TRice, but a little more mellow, the Lib TRS or the GNU Riders Choice are both good alternatives. Neversummer has a similar design as well, and the SL would be the tammer version....or even the Legacy which I think is a little less stiff than the TRice.