I was lucky enough to come across one of these in a vintage store. I paid under £80 for it, completely NOS (although it did have tri-bars and tubs wheels) which i have since changed.
It's also worth noting, the Shimano 600EX group-set is another point not to be over looked. It was preferred...
I know the previous owner of this bike and the bloke who sold it for him. Ironically, i offered him 600 for the frame and he said he preferred to get 'top money' for it... He'll have only got 450 after his fee's too.
Still, I do find it strange that on a buyers market like eBay you picked it...