To me it is worth the extra 20 bucks. To you... i don't know.
It's still "balanced", other then most computers with that CPU usually have a better GPU and cooler. also the tends to have a slightly better Power supply.
Well, that GPU is previously generation mid end gaming card from AMD, so that will explain the price.
it's gonna do just fine for most games, but don't expect Crysis 2 on maximum graphics and still be running smoothly.
Is the build purely for gaming?
If it is you might want to go for a core i3 third generation to save money (not the one you had chosen) for a better GPU.
I am talking about this one: Intel Core i3-3220 3.3GHz Dual-Core Processor (BX80637I33220) - PCPartPicker
it's slightly faster and have better power efficiency for only 4 bucks more.