[arprocter]

On Dell you'll probably be stuck with the original mobo, and their SFFs don't take standard PSUs

[sevensor]

In favor of their SFFs, they get retired 10k at a time, so you might as well pick up a second one for spares.

[arprocter]

Not a bad call, although you'll probably need to upgrade the PSU to add a GPU (if you can find one small enough to fit the SFF case)