wow can you say "opinionated"!

yeah i've used kingwin power supplies on every gaming rig i've ever built. kingwin and thermaltake. they have dedicated, and often several 12v rails. this particular one has 4 12v rails, totaling 60a. they're pretty good power supplies. and modular is good too

Phenom II may be better bang for the buck, as is P45, DDR2, etc. However, this PC i didn't want to be bang-for-the-buck, i wanted performance. The DDR3 cost under $90 for 6GB (not bad), and the CPU was a little over $200 (not bad either).
The Creative card, you're right, is overkill - onboard audio is usually sufficient, but i have a 5.1 surround system in my room, and this card i already have from my previous build, so it's no cost to me now

Even 2 years ago it was only like $75