Agreed- plan on a re-gear. 4.56 is MINIMUM with 37's, 5.13's seems to be more the going rate. That alone will hurt that budget a fair bit if you don't DIY. Even so, figure $5-600 for gears alone, maybe $5-800 for installation. OEM gears with 37's will leave you DEAD slow.
Figuring beyond that, check with Rough Country- their 4" lift (without arms) runs $499, and they'll do a discount if you say you're from the "other" forum (they'll ask- say yes
). Beyond that, you'll at LEAST want front lower control arms ($249 from Rock Krawler, and they may hook you up since you're on here), a front track bar ($149 from RK), and an alignment- figure $100-150 for that.
Beyond that, sooner or later, you'll need an aftermarket driveshaft ($500 or so), adjustable rear upper control arms ($199 from RK) to set your pinion angle.
That's about as cheap as possible with new equipment. Even if you install the gears and lift yourself, that's still $1500 for the basic kit, with track bar and front LCA's, not including shipping on parts or discounts.
Doing a 4" lift yourself for ~$2k is POSSIBLE, but I wouldn't recommend it. Save up the extra scratch to have an oh **** fund for the DS and rear upper control arms, and to do a full lift kit. The 3.5" lifts from Rock Krawler are a great setup for not a ton of $ (and they're good guys to boot), as are the Fera Flex, although their setups are more expensive (still great guys there, too). The bottom line is, while you CAN, you would be MUCH better off saving up the $ to do it RIGHT. Adding more adjustable control arms (in kit form, or individually) will allow you to improve, or at least maintain, your ride quality on-road and off. Having the cushion $ for a driveshaft and rear uppers is almost mandatory above 4", and at least the smart thing to do.
Best of luck, and ask any questions you come across- Mark W.