I've had a DP2 for aout a month, and despite its quirks I absolutely love it: as you say there's something in how the Foveon sensor renders images which I have not found in my other cameras. If only it had a real rangefinder instead of AF; it would be one of the best cameras ever made.
And I have to say I also like SPP very much: it's easy to use, wb controls are accurate, and the x3f fill light function is magical.
I posted
a quick comparison a while ago against my Kx at mflenses.com. In fact, I just sold my Kx and will probably start looking for an SD14 or SD15.