I've always been interested in weird and wonderful frame design, from Moulton multi tube /small wheel to Paris Galibier.
First up, two designs which shouldn't work but I think really do : French built Ganolo curved seat tube and the the really avant garde carbon monocoque Vitus ZX1
Razesa made some excellent frames. They made a few of Indurains tt bikes. I could have picked one up in Banesto colours in 2010 in Zaragoza , but getting it home would've been a nightmare.
They've got a dedicated sub forum for big bikes and frames, and they're London based so you can get a bit more cash! Value wise I'm not sure, depending on the condition of the paint, maybe 4-600?
It looks like a 63/64cm. About 25.5 inches. If you're doing it up to move it on, you might have a bit of luck on the LFGSS forum as they've got a big frame sub forum.