Alpine, Becker or Nakamichi for a headunit....
Theres loadsa brands for subs & amps such as Genesis, Directed, PG, JL, etc etc
speaker brands e.g. Rainbow, focal, boston acoustics, MB Quart or DLS. or diamond.
Ive got a nakamichi for sale for about £200, usually £500, but seeing as ur looking at buying that sony headunit i really dont think the nakamichi is for you! even tho it will sound better than any other headunit u will look at!