West System is one of the best, I have used it in the past on a few projects. You might also take a look at MAS Epoxies. The MAS line is right on par with West System and some people even say it's better. I used it on my last boat and will use it on my next one too. It is priced a little bit less than West System, so that helped with my decision. Boater's World still had a store in KC when I did mine, so I didn't have to pay for shipping and that's what influenced my decision the most.

You will get charged a haz-mat fee when shipping epoxy, so your best bet is to see what's available locally before going the mail order route, or search for a supplier who offers free shipping or will eat the haz-mat fee.