Go to audiosavings.com and purchase a hifonics brutus 1700.1d. Its 1700 watts rms in a 1 ohm load, 1200 watts rms @ 2 ohms, and 600 watts rms@4 ohms. THe amp is cea 2006 compliant. Meaning that it has been tested and confirmed that it pushes the power stated by Hifonics. The amp is on sale for $200. Grab a Boss Audio phantom 12 inch sub for $60 and grab a ported spl box for a little under a hundred. That puts you at about 360 with free shipping. If you use everything correctly you should really get some bump for the money you have in it. Look at Boston Acoustic G1 or G2 12 inch woofers as well. Boston makes really nice quality stuff. Make sure you buy the dual 4 ohm boss sub and wire it parallel to achieve a 2 ohm load. The sub is rated at 1150 watts rms. Not sure it can handle that but it will bump ok for $60. I am a JL Audio or Boston Acoustics type of guy, but realistically you cant even buy a JL Amp for 400. Check out the Boston Acoustics Gt 2300 amp on
Amazon its going for about 240.