The Pro-Clockers crew have included four different brands of DDR3 in their roundup. As DDR3 boards start to be more widely available, this should give you an idea of what's available in the 1800MHz range.

"I will take some of the fastest DDR3 modules on the market and see how high I can get them to overclock. We are taking four sets of the highest quality DDR3 that are advertised at least 1800MHz from their respective manufacturers."