Pulling the optical out of the 420 requires moving the PS, not gonna happen. I've made the executive decision to wait for the optical arrive (and, I had the same one in my hand a week ago at uCenter for $20 - Oh well). The box is fully together, just no OS... could be a blessing, I should get some stuff done around here and I still have two DCT's running on the 420... give me time to dream about cable management etc.
Oh, btw, all of the help I've received is greatly appreciated, those of you who pushed for modular psu saved me, that might have been the tipping point. Although the two most important things I've learned thus far:
2. The Guides are the best $25 you can spend on the HTPC thing.
1. You can save that $25 by buying a machine directly from The Man. (my co-workers, all computer geeks, think I'm crazy/too old to be putting hardware together from scratch to save a few hundred bucks).