Hello ... welcome to the forum ...
The new TripleHead2Go Digital Edition has one 16:10 widescreen solution ...
3840x800 (triple 1280x800) 60Hz ... 3 x 16:10
So using this you will not have a distorted image ... assuming your monitors can do 1280x800. (I think they can)
Any other non 16:10 res will give you a distorted image.
I keep seeing posts saying the ideal setup is for 3 19's due to the native resolution of the display.
That would be for 3 x 4:3 monitors at 1280x1024 ...
I have 3 20" Dell's with a native res of 1600x1200 but I run them at 3 x 1280x1024 ... they look fine at that res.
So all in all ... run your current monitors at 1280x800 ... see what the image is like ... if your happy ... go do what you are planning ... :D
Any other TripleHead resolution would give you a distorted images on your screens.