I hope you haven't yet bought this. You can do better by getting an X4 955 and putting the extra cash into a 6850, $130 after rebate: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
With those in the box, it'll run the most demanding modern games on high settings (Crysis 2, BF3; far from the highest settings, but quite pretty) and will max less-demanding ones (SC2, WoW). I consider maxing to be 60fps.
Ya, this is quite a decent build.
1. Cheaper platform. $60 can get you a decent H61 motherboard which will be compatible even if you wanna drop in a i7 2600 later. A decent 970 motherboard with AM3+ support costs $90+
2. The i3 is stronger on stock settings. The 955 pulls ahead when overclocked, but the stock cooler is crappy, meaning you have to invest in a aftermarket cooler to really see a difference in performance (push it towards 3.6GHz+).
So going with the 955 will give you marginally better performance, but you have to pay ~$60 more for it, which is probably not worth the gain in terms of performance alone.
However, you will get other perks such as multi card support, USB 3.0, SATA 3 and faster RAM which would probably make it worthwhile.