My two cents worth:
I spent hours on the phone trying to rig up my OCD "perfect" 2.5" coil lift. Went with RC for price, simply because I'll be going up again in a year or so (probably less
). Their customer service left me cold, and their shipping department ran my stuff a day late, then UPS lost the shocks- the last bit isn't their fault, but it was (because they ran late) due in last Friday, right before a long, holiday weekend, so I was SOL. RC also said they'd be in on that Saturday, and weren't. The 2.5" coil kit also lacks rear swaybar end links, which you will need, and no rear brake line extensions, which also aren't 100% necessary, but helpful, as the lines are stretching at full droop.
Tera Flex, on the other hand, has spectacular customer service. Carl is a regular over on JKO, and gets back to you quickly, and with honest, useful answers. The ONLY reason I didn't run their 2.5" coil kit is that they don't have separate 2-door/4-door kits, so the 2.5" turns into 4+" on the 2-door if you don't have steel bumpers, a winch, etc. He said they may be rectifying this soon- I wish it'd been sooner! With regards to their spacer kits, the 2.5" BB is a COMPLETE kit, which I like- comes with brake line extensions, rear end links, and the option of new shocks (do it!).
I haven't had any dealings with Daystar, but I've heard good things.
That's my 2 cents- Mark W.