I recently purchased a vintage Guerciotti, campagnolo super record everything, modolo brakes, s. marco saddle, everything original. i was curious cause now im starting to have second thoughts on my purchase, my question is if i was to sell this and purchase a more modern bike, $700-$800 limit new or used, would i notice a considerably large difference in my performance or would it by minimal and not worth the trade? This is my only bike, and i try to ride as much as possible, advice? thx