You have to look at YOUR needs. Seeing that programs and devices which you use are not supported by 64 bit, I suggest you install the 32 bit version.
If and when you replace or upgrade the devices and programs to 64 bit complient versions, then you can install a 64 bit OS. Chances are that by that time Windows 8+ may be released and you may be ready for a new computer.
I'm running the 32 bit with 3 GB of ram, from the Beta through RC to RTM without any problems.
I do a lot of video editing and record 3 FTA channels at the same time without any problems, the 3 GB handles it fine.