fiznat wrote:budget:hmm I was thinking like, under $300 for both sub and amp ...
Based on that, I would suggest a small Autotek 2 channel amp SX2100 or so, check ebay for deals, and an 8" Bazooka (unpowered) tube.
Others may look down on this set-up, but for someone looking for just enough low-end to drown out the road noise, it will serve you just fine.
Allow about $35 to $50 for fuse, power, speaker wires and cables.