According to the ANS, the EPR, the ESBWR, the PBMR, the Toshiba 4S, the MHIPWR are all at the NRC awaiting review. In-fact the EPR went through a design change to incorporate more passive safety systems. The AP-1000 is still the only Gen III reactor approved for use. There is a lot of competition now worldwide since Westinghouse signed the contract to build 4 AP1000 plants, but I don't expect any US Utilities to bite the bullet until they see how the 1st one goes. Nobody wants to be the guinea pig on this.
Personally I like the PBMR, but that's just my opinion.....and yes this is proven technology.