By the way, don't base your decision on the processor's clock speed - that's a really inaccurate and outdated way of doing things. Even 10 years ago there were Athlon XPs outperforming Pentium 4s despite having significantly lower clock speeds.
EDIT: And what's said about the graphics in build 2 is correct, but only in that the integrated graphics are hugely inferior to modern cards that aren't rock-bottom budget end. The 6450 you're looking at there really is rock-bottom budget end though, so there's not really much difference there. Check out this chart:http://www.tomshardware.co.uk/gaming-cpu-review-overclock,review-32570-5.html
You'll see G630 is rated two tiers above the older options.