What you need is a weight bench, and some dumbbells to bench since you don't need a spot with dumbbells. I'd buy 3 sets of dumbbells in the range of what you can do (for ex: 60's, 65's, 70's) within 10 or 20 pounds. This way, you only have to buy more weights in accordance to your progress (ex: buy 80's since you have progressed). You can also warm up with the lightest for any of the 3 chest exercises. For everything else, buy a bar with 2 pairs of 45's (1 pair if you're just starting to work out), a pair of 25's, and 2 pairs of 10's and 5's. Buy an Olympic squat rack or cage for squats and deadlifts. Your bar can also be used for curls and bent over rows for your back. You should also get an adjustable pair of dumbbells (bars and clips) so you can add and subtract weight for dumbbell curls and shoulder presses.
If you have any money left over: For cardio, I'd get a recumbent bike that keeps track of your calories and distance. If you can't afford it, just run a mile! That's all you really need...
To summarize:
1)Flat Bench (without the bar holder). Make sure this has feet that DON'T SLIDE.
2)Olympic Squat Rack/Cage
like this.
3)straight bar and clips
4)2 pairs of 45's, 10's, and 5's. 1 pair of 25's. 7 pairs total.
Like here.
5)pair of dumbbell bars and clips
6)Recumbent bike if you have any money left over.
Like this.
7)Weight belt for squats/deadlifts/bench
As long as you're hitting the big 3 compound movements: Bench, Squat, and Deadlift (some would argue biceps and back are major as well) you can hit isolation exercises for any other muscle such as dumbbell calf raises, weighted dumbbell leg lifts for lower/upper abs (done off bench), dumbbell shoulder press, dumbbell shrugs for traps, etc. The only thing you might be missing is something for your lats, but you can hit them in other ways like wide stance pushups. You won't need a spot for deadlift or squat b/c of the cage/rack, and bench you won't need a spot b/c of dumbbells.