You are a little taller than me, but about the same weight. I am 5'7 (174cm) and 134lbs (61kg) and I wear Orca size 5. I have found they are cut for leaner "runners" so Orca should fit you well. You are definitely going to have to try it on. The size 5 is the right size except that it is probably a little too short. The size 6 is the right length but probably a bit big in the belly and chest.

If you are not able to try on wetsuits in a store, you might want to consider Xterra. Really good return policy and encourages you to make sure you have the right fit.

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Jeff Abbott - @run1fast
jabbott@headsweats.com
Headsweats - Custom Team singlets $8 / Cycling Jerseys $25
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