I've watched a bit of gameplay from VIII and the open world nature was really impressive to me, atop that I've heard the game is stellar. So I'll definitely pick that one up.
As for VII, I am on the fence. It's likely going to release right around SMTIV: Final, #FE (which did not have any coverage during the Direct, makes me think mid-to-late summer release), and some other stuff we don't really know about yet, so another huge RPG is a bit daunting in that time of the year. However, I have heard that has one of the best stories in the entire series and is quite a good entry, so this is going to be a tough choice to make.
As for the 3DS version of DQXI, I wouldn't be surprised if the handheld version of NX is backwards compatible, making that game a possibility for the future.