It probably makes sense to keep your additional 'investments' into this bike at a minimum. But overall I'd say you got an awesome deal and should be riding it rather than re-thinking the purchase. (Of course I'm a little bit Bianchi-biased...)
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"The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson
'14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur