Being a tad more realistic. Good tool kit, jack, and stands. $500 should easy cover it.
Not knowing what the car is but assuming its a turbo...
Stereo, at least a head-deck if the orginal is a bit RS. But I could EASY spend $10k on a car stereo and justify the cost.
Brakes as mentioned, just the normal if the lines are fine just the fliud pads etc. Say a good $1.5-2k there if your paying for labour. Maybe $1k if your lucky getting stuff on the cheap and do the stuff yourself.
Suspension. Probably worth while doing all bushes to be safe anyway, new suspension coils and shocks, sway bars, blah blah blah then install and a proper wheel alinement... $2-3k quite easy.
Then with the $50-400 you have left depending on how much you spent on your head deck... You could get a better filter, and or a bleed valve, and maybe someones cheap 2nd hand exaust, maybe...
You need to learn how to drive the wheels off the car before getting more power, if you dont know the car more power is pointless.