definetly 177, and mount them dead center, (or real close) in 1-2 ears you will still fit them ,and thats god, but the 177's will be way better now, specially if yuo want them mounted near the center
im 5'11 135. i was considering getting the 167 instead. I was thinking I wanted a lighter skis and wanted to be able to spin well. whats the logic in getting the longer. better carve, running length, overall for turning/initiation?