My friend has that Clarion HU and he's happy with it, but if you don't mind used, look on eBay. I'm a Clarion freak/collector and I wouldn't want to shy you away from Clarion, but you can get slightly older HUs for cheaper, more options, better value if you look.
I'm also a TREO fan for subs. I could get a 10" TREO TE for that $180 from a auth. dealer and it would easily out perform the PB10 you have. Another very well respected sub company.
And listen to Denim, he won't guide you wrong. Denim is SSA, so he's business smart, so his unbiased input is also honest.