Touring Tyres / Touring Tyre Size

32c Bontrager Race Lite Hardcase, as much puncture protection as the Marathons but weigh less and smoother rolling, imo.

Wanted some of these for summer commuting. Cant stand the rough ride of most 32mm commuters.

That's fine but if you were getting a bike built like the op would you have it built to only take 25 mm tyres? You can still run 25 mm tyres but if you give yourself room for 32 mm tyres you have some flexibility built in.

Totally agree.
I think a frame built for max 32mm with guards, would still look fine running 25mm's. Its just a couple of mm each side. The height doesnt matter so much as you're going to want longer chainstays for stable handling, and to avoid catching your feet on the panniers anyway.