Been searching for a vintage bike in my size 54cm, mostly looking for Centurion Ironman Expert or Master but NO luck.

So I wonder what is the best bargain i can get on another vintage, with 531 Reynolds instead of Tange 1 for the Centurion.

I have read that the 531 Reynolds frames are more expensive than the Tange 1 Frames, but they are similar in performance, is that true?

Looking for something with 6 or 7 gears and with 105 or 600 components.

Thank You