I don't think you will get the look you are going for, but I don't think it would look bad enough to not do it. Many people have to do their projects in steps to make it affordable. If you were looking at 6 inches or so, I would say wait for the new tires, but with 3-4" you should be fine until you can save up for the new tires. Go for it! It will also give you a greater understanding and appreciation for how your Jeep handles and reacts with various combinations of lift and tire sizes.
1998 TJ Sport, 4.0 I6, 4.88's, super 35, Auburn lockers f/r, 7" RK, 36 Iroks, 15X10 ProComp series 51, K&N, swaybar disconnects, Ramsey 8500lb winch