Thanks everyone. You are all incredibly well informed on the subject, and this is a great introduction to the general atmosphere of APUG forums. I've decided to see if I can get my hands on some that you've mentioned, see if the weight/feel is really an issue, and to familiarize myself with TLRs in general. If I can't, I'll likely just get the C330 and enjoy.
I'll definitely by frequenting this forum often!