I would stay away from JL not because they are junk just because they are way over priced for what you get from them. Also on your budget there is better stuff you can get for your money. Sorry 2fast4thelaw just voicing m opinion. Also I think 750 is stretching it a bit I would say 1000 is a good price range.
Well you asked for my recommendations so here they are.
Amp
The only reason I selected this amp is because of its size and the power it can produce. The other amps are alternatives to this one
PDX-5 - Alpine 5 Ch 600 Watt Digital Power Amplifier PDX5
PA250.2 - Polk Audio 2 Ch 250 Watt Amplifier
TRX2.550 - Soundstream 2 Ch 550 Watt Amplifier
16-MCA150 - Memphis 75 x 2 ClassAB Full Range Amplifier
Sub Amp
BXi-608 - Hifonics 1 Ch 600 Watt Brutus Amplifier
BXI 610 - Hifonics 600W Class A/B Mono Amplifier
ZX500.1 - Kicker 500W 1 Channel Amplifier
Sub
SR124DVC - Polk Audio 12" 1400 Watt Dual 4 Ohm Subwoofer
This one I recommend if you are just looking for some bass and nothing precise
07CVT12-4 - Kicker 12" 800 Watt 4 Ohm Subwoofer CVT12
And this being my personal favorite
IDQ12V2.D4 - Image Dynamics 12" IDQ Dual 4 Ohm Subwoofer
Speakers
Budget
MM6501 - Polk Audio 6.5" Component Speaker System
165A1 - Focal Access 6.5" 2 Way Component Speakers
CSX 265 - Rainbow Dream CSX 6.5" 2-Way Component System
Higher End
SPX-17REF - Alpine 6.5" Type-X Series Component Set
XS-65 - Image Dynamics 6.5" 2 Way Component System
SR6500 - Polk Audio 6.5" 2 Way Component System with External Crossover
Now with all this you can find a budget by choosing different things. My personal opinion would be to buy a part at a time of the better quality stuff. I am a personal fan of Image Dynamics and practically swear by there products. You know to reach me if you would like some additional help selecting parts. SORRY THIS LIST TOOK ME SO LONG I HAD TO THINK BEFORE SELECTING EACH PART.