rockford fosgate are brilliant!!!!they quote REAL figures!not crap like all the cheap stuff you get from birmingham in the back of max power magazine!
pioneer also get a thumbs up from me for quality.
look at rms figures not peak,they tell you nothing.
get a good set of pioneer components up front with a nice 12" sub in the boot (if you prefer punchy music rather than fuller bass get a 10") run off a rockford fosgate 400 4 channel amp,2 channels for the front and 2 channels bridged for the sub,set on the amp appropriately.
then get a decent head unit,either rockord fosgate if you can find/afford,or a pioneer from halfords!
should sound good.