Quad CPU on a 775 motherboard is what I would go for if I am looking into not spending much money.
Not everyone here has money pockets here and that is what some of you have to understand.
Some people just can't upgrade to a i5 or i7 like that.
I hate when people answer these topics and clearly they are not thinking about helping the next person but
thinking about themselves and their computer base on what they have. Just because you have a i7 or i5 system doesn't mean
that I should get what you have base on what you know about what the New CPU can do.
Just think about the person what their needs are. Some of us are not rich and have rich parents.
Some have jobs, rent and bills to pay. Don't forget children..
Not everyone could effort have i7 amd i5 systems.
That means New Mobo, New Ram if needed, and new CPU.