Where to start...
 

...if I intend on building up a "vintage" frame?

I have my eye on a mid-eighties frame with 126mm rear/ 100mm fork spacings.

How modern can I expect to get as far a components go?
If there are any links ya'll might be able to refer me to in regards,
please...:D

I'm guessing that cold setting the frame to 130mm might be a strech.
What do you think? Does cold setting become a PITA, if removing the rear wheel?

Campy Super Record or C Record group rear...
What other recommendation might you have?

Thanks

Steel frames are easy to coldset so you can go brand new components if you'd like.

start with www.sheldonbrown.com or do a search of this forum.

Shimano, Suntour, Truvativ, Sugino, Dia Compe, etc., etc.

i have never coldset a frame myself, but from what i have read 4 mm (im assuming your talking about the rear) should not be difficult at all. hopefully a member who has done it (there are alot of them) will come along and give you some better insight.

Been there ... done that. Capo #1, a Reynolds 531 frame originally built with 120mm rear dropout spacing, currently can easily take a 126mm "standard" 6-speed or a 128mm 7-speed. I encourage you to go for it. If you have a high-quality early 1980s bike, the frame is vastly superior to the components. This is even more true of most 1960s bikes.

Spreading a 126mm rearend to 130 is only a matter of 4mm. That's like a sixth of an inch. No trouble at all, go for it!

Thanks all.