u can get a set of last years infinity kappa series 60.5 components for 100quid, and there nice speakers.
as far as subs go, the alpine type s & r are nice subs, but for a few more quid im quite the fan of the polk momo stuff. it starts at about 120 quid. ive got one of the MM120's which is one of there classic style subs running off a JL audio 500/1 and it sounds nice.