it looks like a very small frame. how tall are you??
for $600 you can get new from bikes direct.
disadvantages of buying online (before everyone else chimes in)
some assembly required.
not as easy to return/exchange
cant test ride first
local mechanic support/year worth of tuneups
advantages.
get a nice product at a greatly reduced cost.
$500
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks