Security is my main concern & reason for doing the upgrade as in such things as bank account etc. That and browsing compatibility. My cell carriers website doesn't like IE8 nor Firefox. Other than that it doesn't matter to me.
As soon as I posted I saw a bunch of replies while I was typing. Regarding security, I would never question someone’s requirement for a secure OS. I have a clearer understanding now.
My apologies for being so emphatic about finding someone local to help you out. I was wrong to assume that you didn’t have the situation comfortably in your control.
I have a home built system from the same era (2007) but with some upgrades including Win 7. If it is running well and you’ve invested as much as you intend in hardware, then I think you will be meet all your needs and be satisfied with the OS upgrade for the near future.
Again, apologies for not giving appropriate advice in my previous comment.