so far i got my girl a pioneer 840mp deck and kappa 60.5cs components for the front...i'm plainning to get her a set of kappa 63.5 3way speaker for the back for her del sol

kappa 60.5cs = 2-90rms / 270 peak
kappa 63.5 = 2-75rms / 225 peak

pioneer 840mp = 22rms / 50 peak

the speaker is underpower.. and it could sound alot better with an amp..But what amp should i get??? and i really want to power the back speaker with the amp too...my budget is like under 200 for the amp..

US acoustics USB-4085 85W x 4 $180 (would 85rms be too much for the rear?)

US acoustics USB-4065 65W x 4 $130

Alpine MRP-F200 40W x 4 $155 (not sure i kinda want atleast 75rms)

JBL P80.4 40W x 4 $145

Audiobahn A4401Q 50W x 4 $180

Pioneer GM-X564 50W x 4 $165

I also might be adding another amp and 12" sub which probably be kappa perfect 12 dvc / 350rms with a JBL BP300.1 / 300rms @ 2ohm (would that amp be enough power for the sub if i parallel wired it to create 2ohm) sorry i'm still a newbie at this stuff..i started when i decided to get a hu as a xmas present for my girl.. so now im hooked to make her system sound good =)