You sound pretty sure that you'll still be in the market for racing wheels. In that case I'd go with 5's instead of 3's this time around. Your idea of trying some other wheels and researching the larger purchase more makes a lot of sense. Good luck!
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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