I think the ritchey crank is pretty cool...aebike has it for $125.99, pretty good price!
http://aebike.com/site/page.cfm?PageID=30&SKU=CR3254
it looks like they currently don't have 170 length, but it comes and goes. but here is a little trick that some have done...performance will price match and with a 10% discount code you can knock another 12.59 off! try this code: 6001400
I've got a 50/34 cranks and I run a standard chorus front der...works fine. I believe the ritchey requires a octalink bb...which means shimano.