From HTC's website-
Inspire Specs- 4.8” x 2.7” x .46 (LxWxT). 5.78oz weight w/ battery
DHD Specs- 4.84" x 2.68" x 0.46". 5.78oz weight with battery
Looks like it is exactly the same with the Inspire figures rounded (not 100% sure but 98% lol)
Definitely not getting an SD. I think 4GB would probably be enough for me. All of my apps are on a 512MB partition on my SD Card and I have over 100 of them. So I have zero need for a 32GB SD (plus I already have an 8GB Class 6 SD on my Liquid which I can easily re-format and transfer over if AT&T does not include an SD).
Only accessories I need are a screen protector, a case. And MAYBE down the line, a dock (not necessary but I could see how it could potentially be useful).
In terms of case, I am probably getting Otterbox. Little bit bulky, sure, but the ultimate protection for the phone coupled with sleek looks make it seem like a good investment. As somebody who has dropped my Liquid in the past (slightly ruining the screen, I would not risk it. Tho HTC probably has MUCH superior build quality to Acer).
Furthermore, I do know for a fact that the Otterbox Defender AND Commuter Series also includes a protective membrane (or a self-adhering screen protector) for the screen so it kills 2 birds with one stone (making it more worth the investment).