Samsung's Galaxy S2 is the successor to the popular Galaxy S. It has a 4.3" WVGA Super AMOLED plus display, 1.2Ghz dual-core processor, NFC, Bluetooth 3 and HSPA+. It's only 8.49mm thick at its thinnest point.
The Galaxy S2 is now shipping in the US for Sprint (it's called Epic 4G Touch, and costs $199). It will also be offered for AT&T (they'll call it the Attain) and for Verizon (they'll call ht eFunction). You can buy it unlocked for $608. The S2 is very popular - and is Samsung's faster selling phone ever.
4.3" 800x480 Super AMOLED plus