Sub and Amp set ups...

[FreyBr]

What kind of set ups are people doing that have aftermarket audio??  I'm thinking to get a nice 5 channel amp and run a sub and my 4 new speakers through it all.  10in maybe 12in sub?

I'm just looking for some input on brands, quality, prices, etc.  Not necissarily instruction, I'll work on that later.

Thanks

[Mr. Clarkson]

kenwood headunit, kenwood monoblock amp, kenwood 10" sub

[FreyBr]

So i had been trying to join two different car audio forums since this topic would be more fitting there, but for some reason it wouldn't ever send me comfirmation letter.  But anyway, i don't know how well-versed everyone is with car audio but i know i'm not yet, still learning.  this is the set up i'm thinking about, i just want to see people opinions, criticism, etc.?

Already Have:
Infinity 6022i component speakers

Installing:
Alpine CDA-105 Head Unit

Thinking about:
Infinity Kappa Five - 5 channel amplifier
& either a single Rockford P2 - 10in Sub, or some JBL 10in Sub




What are people's thoughts on the Infinity amp?  I've heard ups and downs about them, but overall good quality... my main reasoning for that is because i can get a deal on it because my good friend's dad is pretty high in the ranks of Harmon Kardon/JBL/Infinity (all those sibling companies) so he said he can cut me a really good deal on it.  Also why i was thinking of getting  JBL Sub, i've heard good things about those as well.  So whats up guys?