Plz leave these kinda for people who know about stuff.
Mono blocks are made to provide 1 channel but can be made to give it to more.
Y only 500 watts,give more.
If u want a low power amp i would say go for sony,get 2 monoblocks,they provide nice power n also they are cheap.
Sony Xplod™ Amplifier - XM-ZZR3301(About 200$)
Maximum Output Power: 1 Ch x 600W at 4 ohms
Maximum Output Power: 1 Ch x 1100W at 2 ohms
if u have a little money den go for alpine of mtx
Alpine MRP-M500 (About 230$)
Per channel into 4 ohms: 300W x 1 (1% THD)
Per channel into 2 ohms: 500W x 1
MTX Thunder TC8001 (Do Not Know Price)
@4ohm: 400W x 1
@2ohm: 800W x 1
If u install 2 of each it wont cost much,also even if u install 1 ul still have alot of bass power as compared to a 4 channel,which will provide about 150W of power