That would be a good base specification, that can be obtained for < £180 ($250)
It also supports Dual-GPU, which I would personally pair it with either a HD 6570 or HD 7670 as they will clock-sync better with the on-die 6570 producing approx. 80% performance gain; basically for less than quarter of the cost you'd get the performance of a top-end dual-gpu card.
Probably also good to keep in mind that the AMD HD 6570 is powerful enough to run STO in DirectX 11 (beta) 1080p full graphics (4xMultisample Edge-AA, 16xAF) at a stable 60fps.
If running on a Windows 7 or 8 platform, then would also recommend a small SSD (8-16GB) that is setup as a ReadyBoost device instead of an individual HDD. Although you won't see quite the same initial performance you would from using as a primary HDD, you will be GREATLY extending the lifespan of the device which many SSDs under heavy usage have a habit of burning themselves out or becoming highly corrupted when ECC fails.
While I won't deny the performance of the Intel i3/5/7 with Floating Point Mathematics makes them incredibly impressive choices for business applications, when it comes to gaming their performance has a great deal to be desired. I would say the same about the NVIDIA GeForce hardware as well, tends to perform better in synthetic tests over real-world application... particularly often must be optimised to achieve stable results, where-as AMD hardware might not achieve quite the same framerates the hardware bottlenecks less often producing very stable and fluid framerates that imo is better for gameplay.
Getting low power consumption isn't just for sissy environmental-friendly guys like myself, it's also good because less power consumed = less heat produced = less noise from the cooling fans = happy times.
To answer your question, it looks like AMD doesn't have an equivalent of an i5 (although those charts are a year old now, they need to make some new ones soon). AMD tends to focus on budget chips. If you're looking at upper-end AMD, you'd end up saving money getting a lower-end Intel instead.
I've gone for an AMD Phenom II Black Edition quad core. It was in a bundle with 4GB Corsair memory and a 1Gb Palit GTS250 graphics card. All for £115 including delivery (ebay). I'm not complaining at that price and it'll do for what i need it for. I'll stick the 680i board on ebay and see what i get for it.
I also ordered some red led case fans, a better cpu cooler, a red cold cathode kit, red screw kit and a cable tidy kit.