RIDGID/TTI should offer a sanding frame for at least one of their belt sanders. This is a very desirable accessory and if one was available I would buy the sander and frame to replace teh DW-433KT I have now.
A benchtop stand which would let the sander be mounted either vertically or horizontally would be nice too.
I like the twin fan design of the R2740 and the extra long power cords on RIDGID tools are another plus.
Many belt sander manufacturers offer a sanding frame option; Festool, Bosch, DeWalt, and others.