- Power Acoustik - yes
- Phoenix Gold - yes
- Eclipse - I dunno if they make amps?
- Memphis - yes
- Mmats - yes
- Kove- agian, not sure if they make amps.
- Alpine - yea
- Kenwood - sorta
- Rockford - ehh..
- Viper - I think they have stopped production on amps, however, my friend has one and it's a bad ass little amp.

I think JL makes an amp that is right in your price range (I forget model numbers and such) it's not the 300/4 it's something eles, but a good amp none the less.