WTT: polk CS175i center for polk CSi20 center

Hi Folks. I would like to trade center channels because the CSi20 is a better match for my setup both timbre & driver wise--but there is no dealer in my area that sells it (the CSi20). My CS175i is only 3 weeks new, have all packing materials and original box with booklet. The specs for the CS175i are better (goes deeper and handles more power and frankly looks better) than the specs for the CSi20 but again, it is not as good a match for my setup. Looking for an even trade. Let me know--thanks