Ken, you might want to investigate other joining machines before you settle on an underpinner. No one machine will do all profile mouldings and the manual underpinners are limited even more because of their lack of pneumatic clamping mechanisms.
I recently added a Hoffmann dovetail machine to my various joining machine arsenal, and it is rapidly replacing the underpinner as my machine of choice. I have a Casesse 830 underpinner which is pneumatic, but has no clamping mechanism, and find that I can't hold many profiles tight enough with my hands to get a good joint. The manual Hoffmann runs about $1100.00, comparable to the manual underpinners. You might also look at the Thumbnailer as an alternative to v-nails.