For the love of all things holy, RUN AWAY!!!!!
4 wheel parts is OK for wheels and tires, and accessories. They're what I refer to as a 'bolt-on boutique'. They really don't know chit, but they do sell the parts, and might have stayed at a Holiday Inn Express last night.
Save up, do the right thing, and do it once. I've been down that road, being broke sucks, and spending hard earned money is tough to do.
Superlift springs ride like poo. They handle like poo. When you finally see the light, and upgrade to better springs, you won't be able to give them away. Add-a-leafs will leave you wishing you hadn't.
Rancho, Superlift, Trail Master, Rough Country all can be lumped in the 'poo' category.
Get quality springs from any of the vendors, and avoid the 'budget' lifts, they're the same relabeled junk. Deaver, Cage and National are all quality spring manufacturers. BC has his coils custom wound, and are just as wonderful.
7" is ridiculous; no matter what you've been told, no matter how big your tires are. 3-1/2" of suspension with a 2" body lift works perfect with up to 35" tires. I'm lowering my Bronc, and it's on 38's. My wife's has a 3-1/2" spring lift and no body lift and clears 35's just fine, I'm considering lowering hers too.
I'm not sure where you're located, but find a local EB club, and get some ideas and opinions out of them before jumping in on something.
