any JL Audio series sub sounds good.....personally if your going with a truck i would stick with the w3-w6 version as it requires less space to produce clean sound. the w3 requires less power to produce clean sound than the w6. im personally not a big fan of the JL amps or the w7 but any old school Fosgate BD series amp or even a JBL BP 600.1 amp would do you good.
on a side note, i had a 03 single cab dodge and ran the following setups.
3- sony xplod 12's, 2000w Power Acoustik Amp (free system) cooked it
3- Audiobahn 12's, 2000w Power Acoustik Amp (free system #2) center sub caught fire
2- Kicker Comp VR 15's, 1- 1000w Rockford Fosgate BD1000a1 amp (Kickers fall apart after a beating)
1- Cerwin Vega Stroker 15, 1- 1000w Rockford Fosgate BD1000a1 amp (not enough room for needed air space)
1- JL Audio W3 15, 1- 1000w Rockford Fosgate BD1000a1 amp (almost a 2" excursion and sounded sooooo clean)
2- JL Audio W3 15's, 2-1000w Rockford Fosgate BD1000a1 amp (stupid loud, IIRC i hit 143 or 148 on a meter) still sounded so damn clean