Kel-Tec is a good way to go if you are looking for reasonable quality at a cheap price and are will to live with the slightly larger size and less concealable shape. Rohrbaugh is good if you set no limits and do not want to sacrifice concealabilty nor quality of construction/design.
The cost is roughly 4 times as much though. So you are facing a decision all Rohrbaugh owners must face.
I would also look at the Kahr PM9 if you are looking for an alternative to Rohrbaugh. But again, they are not exactly apples and oranges when comparing, but more like oranges and tangerines. Alot in common, but both are differant.
Hope this helped a little. Also Keltec is cheaper for a reason, where did they save money?
Allen