There isn't a point, leave it alone. Overclock it if you want, and if you're still unhappy with it, make the transition to an Intel i5. i3 in terms of practical performance (different from benchmarkable) is sidegrade, not an upgrade btw.
Over clock the 955 to around 4ghz, You wont find a 1090T/1100T for a good price right now. The Bulldozer's sad to say is a fail of the year type thing, I always liked AMD but AMD let everyone down by saying its an Intel killer when it can't even pass the Phenom II x4 in most benches. I would with your 955 for now, and wait.
Also if you decide to keep the CPU stock for whatever reason, OC the CPU-NB to around 2600mhz or more, it will give a nice performance boost.
At this point in time I would stick with what you got.
The only CPUs that may be worth upgrading to are AMD's upcoming PileDriver CPUs. Not sure when they are coming out though, but they will probably be about 10% faster on average compared to the Phenom II / FX series.
Otherwise switch over to Intel Ivy Bridge CPU series which basically have on average about 30% more performance than Phenom II / FX.