I just got a Surly Cross Check with the stock Shimano Deore LX (#BB-UN54, 68x113mm) BB, and i want to replace the 175mm triple cranks with something in the 172.5 range. any recommendations? or better yet--teach me how i can search on my own--do i use the 68x113mm measurement to match with the new cranks? how would i phrase the search? never had to do this before....

and under $100 would be nice! thx!