My advice too.
What do you really gain from using 64 bit os ? You seem to be into gaming , are all your programs compatible with a 64 bit win 7 ?
Personally I would not upgrade anything , if you are running slow or sluggish and your current XP SP3 is an old install , I would save what you need then format and reinstall. Your cpu , ram and vid are all more than enough.
I have a little over half in power as you do and I run games in very high modes without a hitch.
IMO you are searching for overkill and if thats what your looking for and you have the extra cash then by all means do it.
Once again IMO I doubt you will see any improvment and going into windows 7 means possible driver issues.
It took Microsoft how many years to perfect thier best OS yet XP ? then the abortion known as Vista...:barf: I plan on waiting a couple years before venturing into 7 , let them work the bugs out !!
As far as DX11 , how many games even utilize it yet ( agh... yea and vid cards , good point !) ??? Seriously , why jump the gun just for bragging rights.
That's my three cents
Tostig