Hello saga! Welcome to the Windows 7 Forums website!
I agree with everything you have stated. There is NO reason, in my opinion, to run a 32-bit or X86 operating system on hardware designed for a 64-bit or X64 operating system.
I have had no discernible difference when using 32-bit software on a X64 OS, nor do I see any difference. Perhaps there is, but the difference is not that great. Plus using the X64 Windows 7 is the way things are going and many pundits on the web foresee that a 32-bit version of the next OS, Windows 8, will not even be available.