Well it all depends on what your using the OS for... as far as performance goes, I find 64 bit kicks 32 bits ass anyday.. especially with 4 or more GB of ram..

Drivers for the 64 bit version aren't that hard to find either.. Also, Build 7022 will not receive any updates for windows as it's not an official release remember.. internal builds don't get updates for the OS itself.. just for hardware..

Build 7000 has received some updates recently and they seem to be working fine.. nothing drastically changed but the updating process seems to working fine..