Didn't notice that the RAM you had listed before was DDR3-1866, my bad. Yeah that is a good deal. Nah you know what you're right though, I've just been getting jerked around by reviews a lot. I picked that 21.5" monitor because it had like 4,500 5 star ratings, but the 24" will have a lot more room for stuff like music composition.
About the PSU, my system is actually estimated at 352W with the MOBO and GPU changes, so I figured the 450W PSU had plenty of headroom.
And incidentally.. this works out to be a tad cheaper, how bout that.
Adjusted for common sense (hahaha):
PCPartPicker part list / Price breakdown by merchant