the A8 has a good GPU build in so no need to add the 6770.
otherwise should be a good office workstation
Actually you could get a better A10 CPU and a 6770 or if you're short on budget, a 6670, and use it in Dual Graphics mode. Performance in Dual Graphics mode here should be a little bit better than a GTX 550ti.
The A10 would also be better for business applications. It'd be worth the 30 bucks, especially if you're not going to go for Dual Graphics.