Hey everyone, I was thinking about upgrading my system in my 06 IS250 and would greatly appreciate some feedback for the setup I'm leaning towards:

Fronts: 6.5'' Alpine Type-X SPX-17REF
Rears: 6.5'' Alpine Type-R SPR-17C
Subwoofer: 1x 12'' Alpine Type-R SWR-1242D (or 1222D, not sure about the ohms)

I'm not very savvy when it comes to aftermarket stereos, so I'm not sure about which amps I need. I'm assuming I need one for the speakers and one for the sub, right? And I'm sure by now you are all wondering why I'm going all Alpine, and that's because I have a friend who can get a very good deal on all Alpine products. I know there's better, but I'm trying to get the best bang for the buck.

Any feedback is appreciated!