What’s the best biz cell phone on cing svc?

I’ve narrowed it down to the following three choices:
(excluding the very best-Blkbrry Prl, due to prohibitive pricing for my budget)
so here they are-which is best for multi-functional business use, audio qlty, etc.?

a. Samsung BlackJack
b. Nokia E62
c. Cingular 8125