+1 on the pro grade lowers & discount. Also, there's a rebate going now on the pro grade. when I saw their video I thought the "low friction" ball joints on my mustang looks like the same polished ball/plastic socket type, and they've been great. The camber bolt kits claim to allow further adjustment than the others too, though I remain skeptical.
If you are replacing a two-piece arm with one-piece, you'll at least need a kit WITH BOLTS for that side, unless you are very lucky - it could just bolt on in perfect alignment. I.m even more skeptical of THAT, so I got a kit for each side.
I didn.t get the uppers yet because i'm still thinking about custom uniball arms for more travel. The better quality uppers aren't cheap, and if you need both replaced at once plus your OEM shocks are bad too, then it's the perfect time to upgrade.
I got the moog swaybar links because they use a bigger bolt and cost less... off-topic maybe, but its something to look at if yours eats end links like mine and you're paying shipping anyway.