My Zullo is beat up and I'm considering a new frame - and then to transfer the mid 80s Shimano 600 group on the new frame.

My current bike is C-T 57, top tube is 55.
This is me:


These are the frames I'm considering:
Concorde
Needs paint

Tubing : Columbus Aelle
Frame Size : 53 cm C-T
Top Tube : 53 cm C-C
Lugs : Concorde
Bottom Bracket : Ital thread
Fork : Concorde
Headset : -
Color : Blue White"



Duell Proffesional
Extreme light super frame made by Jan van Dalen
Tubing : Columbus slx
Frame Size : 55 cm C-T
Top Tube : 54 cm C-C
Lugs : Cinelli
Bottom Bracket : BSA thread
Fork: Columbus fodori laminati
Headset : Ultech needle
Color : Red/Black



....
I don't mind beat up looks of the Concorde and would like to scrape of the paint the put it in orange hehe, and generally would like to have a bit smaller frame than the one I have now. On the other hand Duell is a much better frame and in excellent condition, the price of each frame is not high.

What is a BSA thread? Will my Shimano 600 bottom bracket fit? I have no clue which thread I have on mine.

The frame I currently ride is nice, but I would like to have a more "aggresive" position, with shorter top tube lenght, lower bars and higher seat, think I would benefit from a smaller bicycle. On the other hand, I fear that the Concorde would be too cramped for me. I have a 10cm stem right now, and my current bike is probably a proper lenght regarding top tube and stem, but...

Also I'm currently unemployed so I'm waiting for the next week how my job opportunities will resolve and considering getting a cheaper frame...

I use my bike for commuting and when I have chance, some hill climbing, though I would like to ride if for longer periods. I'm not a powerful rider, the parts will last forever or until I crash.

Concorde:
+ smaller
+ beat up so I can paint it to orange
+ price
+ it is a cheapo columbus alloy, but still a very nice and light frame
- i don't feel like spending money on chroming the fork
- has custom made cable guide (inside the top tube!) that could be a plus?



Duell:
+ SLX
+ looks mint condition
+ has a nice headset (I don't trust mine anymore, keeps unscrewing!)
+ is still a bit smaller than my bike, but I know it will fit me
- twice the price of Concorde
- sorry, i don't really like the color!

Your verdict?