A point being confused here, is the difference between fixed
gear bikes and track bikes. As Sheldon writes,
http://sheldonbrown.com/
Just because there's one chainring, one cog, no freewheel doesn't make it a 'real' track bike. There's points of frame design that make a difference. Brake drilling, water bottle mounts, eyelets, chainstay length, fork rake, head and seat angles, bottom bracket drop, & tire clearances are detail differences between the two. Also equipment such as stem, bar, hub and gearing may be suited for the track, but very unpleasant for the road.
A very nice fixed gear bicycle can be made from a classic
bike that would not warrant a full restoration. Also don't forget
the British version, the "path racer". Again Sheldon has written the
'book' (OK, web page) on this:
http://sheldonbrown.com/
I'm thinking of taking beginning track lessons at Trexlertown this year. If all goes well, and I like it (and live), then I might get a track bike for summer track / winter roller riding. It'll be a used one, and maybe even semi-collectable, but definitely a 'track' bike.
Email me for more links and the address to the fixed gear list.
Roy "...my dog's fixed too" Drinkwater 44x18 (Oct-Apr) Lititz "56 miles to T-town", PA