HD5470 1Gb and Starcraft 2

Hello, dear friends.
I am going to buy a all-in-one PC of the following configuration:

Asus EeeTOP 2010AGT 20" HD+, Athlon II X2 250u, 4096Mb, 500Gb, HD5470-1Gb, DVD-RW, WiFi, cam, W7HP.

I am not a great fan of gaming but still I was expecting some games (Red Alert 3, Fallout 3 and Starcraft 2 for example) so long and my current pc is too old now.

Tell me please, will it be enough to play these games (esp SC2), and possibly, the upcoming Diablo 3?
I think I'll be satisfied with the resolution of 1024x768 and mid-details.

Thank you in advance