Toyota Tacoma set up need your help ?

I had a 06 Tacoma (Regular cab) want to set up for 5 channel set up. Right now i got Alpine CDA-105 HU, Alpine SPR-17S in front ,infinity kappa 6x9 on back. The space for sub less than 1 feet from back seat to back wall.

My budget for amp and sub less than $600

Please, help me to pick the amp and woofer for this set up

Thank you very much

 

I like JL Audio but you can get something cheaper but I'll suggest a setup:
10W3V3 and XD500/3. Run the 3 channel amp to your front components and the sub and run the rear 6x9's off the deck power. You are a regular can so the you are limited in space therefore you want to focus on even sound not to much mids and highs to over take the single 10" woofer. I would tone down the 6x9's by running them off the deck power and turn up the front components with the amp. And power the sub with the sub out on the amp.