I had a 1/3 HP delta that was ok until I started drilling 5/16" x 2" deep holes in W-1.
I upgraded to the aforementioned Rigid drill press (1/2 HP), which is doing the trick. It is indeed a lot more rigid than the delta. Being able to drive to Home Depot and not pay shipping was a plus.
We have an old Rockwell at work that is bomb-proof. The table is one solid piece of cast, which I like a lot.
3"+ of quill travel is good if you want to go from a small (and short) bit to a big (and long) bit without losing your location.