Acooljt said:
I don't know, I think that is more along the lines of your own opinion, simply because bigger calipers do not mean better stopping. Some of the fastest cars out there are running 15's.
What did you guys do to choose the size of your wheels?
Of course its my opinion

that's all I can ever offer when someone asks about what wheel size will they like best.
Bigger rotors
always means better stopping (its very rare that I will use an absolute in a statement too so I feel quite confident)...however, it doesn't mean better acceleration. What I have found personally is now that I have been driving my car on and off for 3 years or so is I am wishing I had larger rotors. I run the 17 inch rims now so I can very easily upgrade to a baer or ssbc big rotor kit when ever I want too.
If you invest $400 a wheel today and buy the 15s...once you start driving your car you
might find yourself wishing you could put something larger on that the kelsey hayes style setup or the grenada disc setup.
There is a good arguement to be made for 15s as well. They fit the car nicely, enable you to run very well performing disc brakes, allow you to keep a side wall profile more in tune with the original stylings of the car, and currently have a pretty strong selection of both street and track tires.
I almost bought a set of 15s for the rear to run a slick on DT....but took a chance and bought another set of 17x8 and picked up a set of 275 40 17 BFG DRs. The car ran 12.5s at the track last weekend with nothing else done (road race suspsension, out of tune carb, 2 yr old plugs) so I am very happy with the technology behind the 17 inch tire choice I made.
I have a skewed perspective on the world since I look at everything I do to DT from the angle of triple use (street, drag, open track use) and the 17 inch rim allowed me the most flexibility in this.