MarAha

someone please help me out...i just bought a system but completely forgot that i had to buy a wire harness. and now that i'm looking for one, i cant find it. i got a 2005 Pontiac Grand Am, 3.4L 4 Dr Sedan

i was interested at first in 2 12" Resonant Engineering SXs or XXX's and then just a few days ago their prices basically tripled so i went crazy looking through the internet for something cheaper ($500 ot under for 2 12" subs) and i heard about the RL-Ps on other forums and heard nothing but good things about them. and $440 for 2 subs, if theyre REAL good is amazing to me.. now honestly i dont know much about systems...this is gonna be my first one (i read alot about them though and know many people with a system). and im reading the description for the RL-Ps and it says 500 watts rms. the XXX i was hoping for was 1600 rms. now just reading that makes me think the RL-P is ALOT weaker. but reading about these subs, it seems like im wrong....(forgive me if i am, i never heard of these subs til today and dont know anything about them) can someone let me know though on what other subs they can be comparable to and if theyre anywhere near the XXXs level?(the old style XXX...not the new monsters) also...if i get them, what amp can you recommend thats under $250 to make them hit as hard as possible?....without risking the chance of blowing them of course haha by the way...i got a 2005 Grand Am (hope 2 of these would fit in there)