This is my next project:

It is a 2000/2001 Schwinn Aluminum Panther frame. Way rare, BTW. As you can see, it would make a great single speed with those rear drop outs. I plan to make it disc with an adapter for the rear.

My only issue is the fork. This is a non suspension corrected frame, and it has a 1" steerer. I would love to get a disc only fork with curved blades, but it looks like I would have to custom order one.

Dimension makes one