I realize that 64-bit is the way of the future, but 32-bit remains the safe choice. In my sideline business, the transition to 64-bit has proven to be rather painful. A lot of (proprietary) business apps are 32-bit only. Those that are "64-bit compatible" exhibit problems not present in their 32-bit counterparts. So far, my only reason for going 64-bit is to take advantage of more than 3.2GB of RAM.