As Twistsol already said,
As a drill press you'd spend far more than that just to get anything comparable (unless you enjoy changing belts to change speeds) and you'd still not even approach the table space on any drill press you bought.
The Shopsmith is so much more versatile than the Drill Press you already have. You also get a Horizontal Boring Machine which is a Drill Press laying down. A feature I have used and love.
One of the weaker points of the Shopsmith Mark V, any model, is the Table Saw. If doing bevel cuts you have to tilt the table as opposed to tilting the blade of a Table Saw. I have a very nice Craftsman Table Saw that I can't remember the last time I actually used it. The Mark V 520 (and Mark 7 & 4) Table System can expand out further that that Craftsman Table Saw. Any of the Mark models can rip a 4' x 8' sheet of plywood in half. My very nice Craftsman Table Saw cannot do that. I have more control being able to add floating tables for infeed and/or outfeed support as opposed to separate support stands. I do have more than the two standard floating tables to do that but if the Floating Tables are not needed for the cut they can be used as infeed or outfeed support. Over the years I have seen many complaints about the height and reach needed when using the Shopsmith as a Table Saw but when I compared my Mark V 520 to my Craftsman table saw the differences in height and reach where very small.
If cutting a bevel on a piece of stock the Shopsmith has an advantage if you want to sand that cut edge you can change the Saw Blade to the Sanding Disk without changing the Table's tilt. Sand at the same exact angle. That kind of functionality can be used in many situations.
I could go on and on but you get the idea.