Brake swap. CPP/ECE v. mcGaughy's

[BMERDOC]

Ok. So I'm planning a lowered spindle/Disc brake swap. I'm keeping the discs 6 lug for now so that I don't have to swap wheels. I'm a stickler for researching everything and getting the best possible deal but I'm having a slight problem absorbing an issue.
CPP sells a 6 lug kit that includes two rotors, two loaded calipers, inner and outer wheel bearings and seals (CP4R-6 @ $129.00). It does not include the dust caps, castle nuts, indexed washers, hoses and several other parts. ECE has the missing parts for $89.00. All told thats a grand total of $218.00. McGaughy's has the ENTIRE kit for $329.00 (63157). Thats a $111.00 difference. Does anyone know of a good reason to spend the extra loot for the McGaughy's set up? Summit has both kits in stock so I'm not worried about shipping times. I'm not sure of ECE's inventory. The rotors must be 1 1/4" to use with the spindles but I figure both kits have the heavy rotors. I've heard of nightmares with dealing with CPP's service but I haven't heard much about problems their quality and again I'll be dealing with Summit Racing.

Any input is appreciated. Thanks in advance guys.

[BMERDOC]

I think I may have found my problem. $129.00 started to sound a little low for two rotors and two loaded calipers. The picture of CP4R-6 shows all the components but I think it only includes the rotors. DOH!!