your better off saving up for the best you can afford, rather than just going for whats available "now"
cos you will regret it in the long run..
save up for an amp, then a sub.... rather than a package, cos you will end up spending twice... upgrading if you get a package.
i learned the hard way.
also, try some of the pioneer stuff.... its awesome quality now. (never used to be)
and the new Vibe gear is braking ground with its digital amps too.... bargains are to be had at your local halfords too.... like a full Fusion Power plant sub and amp package for £149.... 450W kit (RMS)
shop arround..lol