Look into the Rough Country 3" AAL kit. They aren't too expensive and give you a decent foundation. I called rough country directly, and negotiated with them so the price included shipping was 260. PM me for details.
Another good place to start is treadwright.com. They sell retread tires, but not the typical retread. Many guys here run them, and I have yet to see one complaint. I know with 31's you get the high quality of a $150 tire, but only pay $75 or $85.
The 3" kit will run 31's no problem, and with tires, you are looking at 700ish total investment! It's a great start!