Honestly, I have the USAspec PA12 and I think its awesome. Really solid, charges my phone, great sound quality.

The dice pro is okay, you should be getting a dice DUO whatever you do, it's the newest one. Both units are somewhat tough to install though if your car isn't prewired for a CD changer. I'd recommend getting the DICE from Tom G. here on these boards, he's from europeanautosource.com

They have it for 169.99 I think, and he will help you with everything you need to install the dice successfully, he is a great guy. So go DUO or PA12 from USAspec, I recommend the PA12 but others like the duo. Or you could get the dice mediabridge if you want bluetooth!

EDIT: Just saw you have CD changer, in that case the installs should be relatively easy.