I'm pretty sure the Xtreme line of pistols have not come to the US yet, EAA has a nasty habit of making promises they can't keep; which brings me to zhunter's point:
EAA has a tradition of terrible customer service, overpriced spare parts with a terrible selection. Henning Walgren does his best to support us, but he has only a few parts available. On the other hand, Stuart Wong at CZ Custom is a great guy who frequents this forum and will take good care of you, plus CZ USA offers a good selection of factory parts at reasonable prices. If the pistols are the same price, but the CZ is new, take the CZ.