It would help to know a little more. Seeing as you are referring to newegg.com, I assume you mean in $900? Any why Intel? Your picture shows AMD, and besides. I'd think your current rig would be pretty good for gaming. Plus, what is your case? ATX, mATX, iTX, and what is the fan arrangement?
This motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813128059
With this CPU: http://www.newegg.com/Product/Product.aspx?Item=N82E16819115037 (It isn't in stock yet)
And this cooler: http://www.newegg.com/Product/Product.aspx?Item=N82E16835887011
Those are what I'd go for and then get an 8800GT, DDR2-800 RAM and a Seagate 500GB HDD. They're all good value and very quick.
Yes, PabloTeK has a pretty good arrangement there. I might recommend a different processor at some point, because from what I have heard (reviews and a friend at a PC store) the processor can overheat. It doesn't cause any damage, just gets hot. If your machine is adequately cooled, then you shouldn't have a problem. It never hurts to have a second cooler if it fits in your case and budget.
I use SpeedFan anyways, so my readings are probably wrong anyway. The only time it got it right is on my Asus laptop, it was overheating and read 116 degrees celsius (and it was right!).