For price and quality I chose SSBC, I did a lot of research and came to the conclusion that I could get the same or better SSBC kit for cheaper than the BAER or Wilwood kits. I recently got the a-120-2 super duty/cobra front drum to disc nonpower kit for my 65-66. i am really impressed with the quality of the parts and the completeness of the kit, it's got EVERYTHING in there! I got em from www.mustangdepot.com they have the cheapest prices, and I would recommend upgrading to the powdercoated calipers if you have open type wheels. The regular calipers were ugly unfinished cast aluminum and I ended up sending em back to get em powdercoated so they look decent. good luck.
I was in the same boat a month ago and looked at just about every system out there and talked to an owner of just about every system.....long story short...i'm saving up for my Baer Track System up front and Baer Touring out rear @2K.
If this conversion is for the 65 Pro Street 302 with EFI setup you are doing, I'd go Baer of Wildwood. If for a regular old driver or occasional show car (like mine), you can't beat the SSBC kit for price and quality.