Rear Disk or Drums

I am trying to finish up my Dart Suspension to get it on the road for spring. I am doing a Dr. Diff 11.75 Disk Swap up front, Firm Feel Tube A-arms, FF 1.0 T-bars, boxed LCAs, ets up front.

I am changing my 7 1/4 to a B-body 8 3/4 that I have moved the perches in to 42" and will be using the offset hangers from Dr. Diff as well. I plan on using Cobra 17" wheels and 245/45/17's all the way around.

My question is about brakes in the back. Is there a huge advantage of using a disk set up in the back over a good 10" x 2 1/2 drum arrangement? I can get loaded backing plates and drums all new from Dr. Diff for $350 plus shipping. If I use his 10.7 brake kit in the back, it will be $725 plus once I get the E-cables. Is it worth the extra money????

The car will be a Daily Driver that I wanted to handle and stop as good as a 72 Dart could do with OEM type suspension / brakes. It is a 318 air car that will stay that way. It will get a better cam, intake and carb later, but it will not be a hot rod. Just look and sound the part.

Thanks for your ideas and comments......