If you would require a "Shorty McShort" frame and like to race and have a decent hunk of change to put down on a bike....why not go custom? You would get a frame that fits you properly and does what you want it to do (Stiff? Comfort? Both!)
There are many custom frame makers out there who would be great for you. I'm rather partial to Seven myself - a great maker of steel, titanium, and carbon frames known for outstanding bikes and excellent customer service.