What concerns me, slightly, is that you may be expecting too much, from the proposed upgrade. Whilst the bulldozer is not a BAD chip, it's not as good as you might expect an eight core to be.
You will get a decent improvement, in non gaming tasks, but while you will get some gaming boost, from better CPU, and RAM, you will still be held back by your GPU. It's not really up to a lot of modern games, unless you are playing at fairly low resolution.
I'm not too sure how well AMD, generally, handles tasks, you are doing, other than gaming. Maybe difficult to quantify, but some idea would be helpful: how far short is your current system in terms of handling your non-gaming processes? Also, what is your monitor resolution?