Rockford Fosgate, Audiobahn, JL audio, Pyle, Jensen, Pioneer, Pheniox Gold, Insignia, Planet Audio, and a TON of off brand stuff...you have so much to choose from, like was said, some are crappy and cheap and others are great and expensive, you will just have to see what works for you. Every amp brand new is going to "Work" but it is how well and how long it will "Work" correctly.

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2000 FORD RANGER XLT 4x4 Extended Cab 3.0L FFV
Flareside Bed
ACCESS Tonneau Cover-LEER Fiberglass Topper-Manik Brush Guard-Pro Series Hitch
Kenwood Amp and Sub-Sony Deck