Since you asked, I would add these 3 - VT, Miami, and UCF. VT and Miami are the "traditional" mentions when ACC expansion is debated, and I like them for all of the reasons many others have stated - solid FB and BB, improve strength of FB schedule, etc.
I like UCF because it addresses the point raised about geography. The ACC is a southern conference in most ways, and by avoiding the Syracuse/BC region, we can keep it that way. UCF is no slouch in FB, and appears to be on the way up, so adding them shouldn't hurt FB. BB may be a different story, but a lot of people felt the same way about FSU and they have been more than competitive in the ACC.
The Tobacco Road crew will fight expansion to the death, so this is probably a moot debate, but it is still fun to kick around.
GO JACKETS!