Well, the Prime has been out for a while and retails for $500. The Infinity 700t is estimated to sell for $600 for the WiFi model and around $700 for the 4G. Given pricing on the iPad, I think those prices are probably fairly accurate. The $750 (give or take) for the Infinity WiFi + dock wouldn't really be a hardship.
I can afford to wait. I've already got tablets I can use (iPad 3, HP TouchPad w/CM9, Nook Color dual-boot CM7/CM9). It's just that waiting sucks. I've been waiting since last year for a nice Android tablet. Would've already bought the Prime, but thank goodness stock was hard to come by or else I would be suffering buyer's remorse when ASUS releases the Infinity.
