You're not going to be able to get a 4" lift with a suspension lift, and will probably need a body lift because you'll never get the alignment back into spec with that big of a suspension lift. I'm fairly new to the truck world as my previous vehicles were sports coupes (kind of miss my Audi s5 some days

), but I think 3" would also be a stretch for a suspension lift, although you can get adjustable control arms to help with the alignment if you don't go crazy spending all your dough on struts and springs. You can see the setup I did (2" lift or so) and I think I came in well under a grand, especially with the rebate rancho is running. I had more than enough room to fix the alignment with the adjustable A arms up front, so you could probably get into alignment with a 3" lift on a similar setup, but the rear is pretty much maxed out. Again, I don't know a ton about this, just enough to be dangerous and install modest parts on my own vehicle, but I gather that you'll also be stressing ball joints and cv joints with a big suspension lift. There is the 5" calimini lift, which drops your driveline and suspension components down I believe, although I never really looked very far into it since it's a lot more lift than I want and, as I recall rather expensive. Here's a short article on it:
http://www.fourwheeler.com/features/090 ... der-v8-le/
After that long-winded response, my recommendation would be to go with a more modest 2" suspension lift to avoid the negatives that come with a body lift (including lack of additional ground clearance for your frame, etc.) and you should be able to fit your tires and improve your ride within your budget. I'm plenty happy with my rancho and spc UCA setup, and you'd also be able to get good rear springs instead of spacers with a grand, so that's what I'd do in your shoes. However, if you want a big lift for the sake of a big lift, you're going to have to do some type of body lift or the calimini kit. I hope I'm not talking out of my ass (I've spent way too much time on this forum not to have learned anything) and that this helps somewhat.