Needless to say, the Samsung Rex 90 is the most expensive model among the lot at $120 thereabouts, with a 3.5-inch HVGA display in tow, TouchWiz UI, Smart Dual SIM with Hot Swap, Wi-Fi, Facebook and Twitter integration, ChatOn, a 3.2-megapixel camera at the back, and a microSD memory card slot.
As for the Samsung Rex 80, it is not too far off from the Rex 90, albeit sporting a smaller 3-inch QVGA display. Up next would be the Samsung Rex 70 with a 3-inch QVGA display, although it misses out on Wi-Fi connectivity and has a lower resolution 2-megapixel camera. The most budget-minded model would be the Samsung Rex 60 that features a 2.5-inch QVGA display and a 1.3-megapixel shooter at the back.