dtrader, what I didn't say is that I have tried the AT platform and adored it (beautiful simplicity and functionality), so Infinity is already at the top of my list. Other than Transact, Infinity and Proactiv I wonder if AT is used anywhere else.
I was really trying to find some competition with regards to rates/different markets etc. Proactive offer the same platform, not sure if they are cheaper. So I agree with 100% about Infinity.