You can use rears up front, I don't think they give much lift though. YJs are good, as are Waggys. IIRC, stock Waggys are worth about 3"-4" up front. I've talked to a guy that used rear F150 springs up front as well. Lots of options.
If you're on a tight budget, those are probably the ones to look for at a yard.
What are you doing in the rear end? If you're keeping the stock springs in the rear, get another set of rears for the front and you should get about the same height. If you have lift springs in the rear, you want to find some lift springs for the front. YJ, Waggy, 44044s if you want LOTS of lift (5"-6") and are willing to spend some money (mine were $250).