We went with x64 as we were installing new machines which all came with copious amounts of RAM etc. We took and informed risk that rather than limiting the PC's ability to use all it's resources we would try it, as we believed that it would work well (given some of Peter's previous posts) even if not properly supported and to be fair we've never had any problems with it.
Only limit was the 1 pc with an advantech card, it had to be x86. It suffered a hardware fault around the time x64 support for advantech cards was introduced so was rebuilt as x64 and has worked fine.
Engineering & IT Manager Radio Royal
, Royal 2 & Royal Gold.