Well.....Differences in frames are:
(Looking at the 53cm c-c frames of each)

Kilo=Reynolds 520 (4130 Crmo made by reynolds)
Steamroller=4130 tubing (basically the same **** that's on the Kilo)

Kilo BB drop=6cm Steamroller BB drop=7cm

Kilo HT angle=72.5 Steamroller HT angle=73.5

Kilo ST angle=74 Steamroller ST angle=73.5

Kilo wheelbase=98cm Steamroller Wheelbase=97.9cm

Kilo Top Tube=54.8cm Steamroller TT=56.8cm

Kilo chainstay=40.3cm Steamroller chainstay=39.8cm



You might get a little better fit and finish on the welds and paint job on the Steamroller.....But I'd go with the Kilo because of the higher BB, the shorter TT (for me better), and the steeper ST angle (I like the little bit laxer angle of the HT for street riding).

Frame material is about the same, so it's not a factor. If you want a lighter (thinner walled tubing), you could opt for something with Reynolds 631 like the IRO angus, etc...

And use the money you save to get some bad ass upgraded parts.