New valves? Help please!

[RedMule]

I just got a phone call from the guy assembling my motor. He said that I need new valves in the head. Is there any advantage in going with stainless?? Or just stick with stock?? Any other things to consider doing/ buying while I'm there?? Machine work or parts? Studs are already in place. I need some advice quick as I have help lined up to reinstall the motor and it's almost finished. I welcome your opinions as I don't want to wish later that I had done something else while we were there. Thanks in advance. BTW, my i-net is giving me trouble so I may be slow to respond.