The only thing i would think about changing is dont get the power supply with the case. Coolermaster doesnt put high quality PSU in their cases...and a bad one could waste all your nice new parts when it dies.
I save about $20 with either of these over my initial choice. And now that I remember I have 2 Gigs of ram relatively new that I could use from the old computer. It is DDR2 though. But that would save me another $20-$40. Is it worth it to upgrade to DDR3? Like I said before this computer isn't going to be used for anything intensive.