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Do you have different sized cranks on other bikes that you can try? If you can't feel the difference, go for it.
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Does it make any difference?
Generally, crank length makes only a very small difference until you get to too long. That bargain might not be so much of a bargain if it turns out that 177.5 is too long for you. FWIW, I have 177.5 on the race bike, but I'm 3" taller than you with longer than average femurs. If you want to play safe, wait for a bargain to come up in 170, which will definitely be fine since there's pretty much no such thing as too short cranks.
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It does make a big difference (maybe not once size off but two sizes will), but if they are second hand why not try them and resell if they don't feel good to you?
The problem with going too long in the cranks is that you may not have the hip flexibility for a smooth pedal stroke.
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withered_preacher
gbj_tester
mind_maze
@PhilPub
Crank arm length.
Wasn't sure where to put this. I usually ride 172.5 but have seen a possible bargain come up at 177.5. Does it make any difference? FWIW I'm sort of medium-sized, 5'10" and ~31" inside leg, femur normal size as far as I know. Apologies for mixing up metric and imperial. Cheers.
-edit- This is on a geared road bike BTW so clearance not an issue.