To fit 35s you may be able to get by with just a 6" kit but i doubt you'll have much flex before stuffing a tire if you wheel the truck. I have a leveled 6"kit and 3"bodylift and I'm running 37s but then again I don't wheel my truck. And gears, most say nothing less than 4.56 with 35s.
If you're on a budget be patient and keep you eyes on craigslist and here in the classifieds. I scored a set of 64"chevy leaves, beltech 6400 shackles, Superlift Superrunner steering, drop pitman arm, and a 6" Skyjacker classII lift complete with extended arms, stainless brake lines for less than $500combined. Heck of a deal! Keep in mind though it took me about 6months of living on classified sites to acquire all of it.