I would agree. At that price range, theres only two options for me... the Alpine one described, or Cadence. Cadence is one of the best US audio companies for SQ-meets-SPL type systems (the all-round performing equipment youre lookign for). You can get an excellent Cadence set-up with two 12" Ultra-Drive UD12-4 subs (metallic orange with electro-luminescent cones!!) and a Q3000 300W RMS amp (matching orange metallic with orange interior illumination!) complete with a wiring kit and a double 12" box for £285 at Hendon Car Stereo (0208-2035225, www.hendoncarstereo.co.uk). This is a lot cheaper than even the best US on-line wholesale prices for these items, and I cant recommend it highly enough, I was blown away by the sound and as a bonus it also looks awesome!!
But if the idea of something a bit different doesnt appeal, the Alpine set-up, as Gengar rightly pointed out, is also excellent.