If the current wheels are true and evenly tensioned, you are probably fine. You'd see a slight difference with a lighter alloy set with wider rims (RS81?). But I'd say that's not likely worth it. Carbon is throwing way too much $$ at this (IMO). Best wishes.
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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