To make it a good driver I would slam a front suspension kit under it, add a rear sway bar, and follow through with a good set of shocks.
That will fit in your budget and make a very nice improvement.

You may be able to add a leaf to the spring pack in order to raise the rear a bit. A new set of springs would do the trick but may not fit into you budget after taking care of the front end.

It's entirely possible that you will undo some of these things with later upgrades. However, your priority should be on making the car save and enjoyable. Without those two things the car stands the chance of falling out of favor.

These things will get you back on the road and give you the chance to enjoy the car while saving for future upgrades.