I just went with the LRS kit for the last two cars and they worked great. Don't use the hardware kit though, it's mild steel bolts. I bought all 4 bolts, nuts and washers from a bolt store. Grade 8, hardened, $5.80 for all of it!!!
I wouldn't waste my money on expensive MM or UPR stuff unless you want to get get critical on pinion agle and you drag race a lot. If it's a street car the $159 LRS kit is all you need.