Randall,
I had a Deta floor model for years. It was a basic machnine and did a good job. Two years ago I bought an old 1940s vintage Walker Turner benchtop, reconditioned it and sold the Delta. I've been very happy with the Walker Turner. So far I haven't missed the extra capacity of the floor model. I love the old iron machines, and the Walker Turner is a good one. So is the Atlas you have. "They don't make 'em like that any more" really applies to drill presses. I agree with the advice that you keep the Atlas.
My $.02.
Hank