i'd first research the style/look that you want over at carid.com; they carry almost every custom wheel manufacturer and design out there. don't purchase from that site though, because they have a poor reputation online.
once you find the exact set of rims that you like, call a local wheel vendor and order that set from them. they end up ordering the set direct from the manufacturer, and will likely give you a better price or price match whatever you found online.