This one, a 1988 Raleigh Triathlon. It has the long wheelbase, and the possibility to mount either 28 mm or even 32 mm tyres. Plus, its high frame gives me the perfect relaxed sit. Still need to change the dropbar to one with only a 12 cm drop though, the current one is just too tiring to use.

It weighs a bit over 10 kg, because of the Brooks saddle, and the tyres that were not really choosen on weight.