as above, forget 2 subs
for that kind of cash spend it all on one
ive got an Alpine Type R and an Alpine M350 amp which you should be able to pick up online for £200 or less delivered to your door
as for any other speakers your possibly considerin gettin the future, forget Alpine, for the money there is better........they make the best head units for the money, pretty decent amps, but there speakers are a bit of a let down when you compare other brands for the same cash