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not professionally, mind, but so far i've ridden:
-moser san cristobal
-raleigh scirocco
-mali ironman (hungarian)
-gürtler (track, bespoke, hungarian)
-privitera (track, bespoke, argentine)
-rih super profi (austrian)
-cannondale caad4
-pesenti fly (i think, no designation on frame)
-kona paddy wagon
-cannondale six13many different bikes designed for different purposes but i loved them all (if they fit/i could dial them in correctly). many of them not high end and still enjoyed all.
if colnagos were cheaper, i'd try them. but i doubt they are that much better as the price tag suggests (comparing them with competing products of their own category of course)
if the op is a pro or a collectionist (neither of which he seems to be but excuse me if i'm wrong) he might notice differences between, say, a colnago pista or a chesini pista (no fancy tubing, just a normal track frame with round tubes). the nago would still cost him more. why? well, history and brand rep. measurable? no.
he should get what he likes. if it's a nago and he can justify it, why not? i just think there are many more options that might leave him with money left to buy a set of atomic22 bolts and in my opinion that's a bit better than an engraved clover..
1: you already decided deep down.. this is the one you'll try to get if you find one that matches the budget.
2: google gruppo spa. cinelli and columbus is the same company. tubing of the mash work is cromor i belive.
3&4: blbs are not well regarded. overpriced random steel track frames. look around here and you'll find lots of frames with better pedigree.
my own thoughts: fuck colnago. not because i have something against it, but because it is overpriced too (in its own league). the brand has many fans and they had a few nice ideas regarding framebuilding but that's all (sorry @saarf i don't mean to flame, just my 2p < he'll correct me soon enough, just watch :)
get some nice 'modern' steel eg. donohue.