let me chime in here i put together a super clean and loud set up for under 950..u are really even with ur budget can afford quality stuff dc ia and fi offer subs in ur price range
i got a dc level 3 15 for 175
rf bd1000 of ebay for 150
diamond and infinity separates for 150
any decent deck u want thats has 3 outputs for like 150
rf 400.4 off ebay 60 bucks..
knu konceptz 120 all 1/0
and miscellaneas install goods 130
and my cars loud and clean..like earlier mentioned if u know where to look u can get alot for ur 800-900 real talk