SYSTEM USAGE FROM MOST TO LEAST IMPORTANT
HTPC with no tuner
basically streaming HD videos, audio, pictures on my HD TV
web browsing w/ multimedia content (Youtube, etc...)
optional SDHC reader
PARTS NOT REQUIRED
monitor, I'll be hooking it through HDMI to a 1080p TV
I don't want to buy an ODD at the moment
built-in video card on MB, no discrete video
PREFERRED WEBSITE(S) FOR PARTS
COUNTRY OF ORIGIN
low-power, modular power supply
anything that is quiet
The only problem with the Antec PS is that it's not modular. The nMedia case looks roomy though, so I'll probably be able to fit everything inside. The fact that I don't have a discrete video card helps a lot too...
As an NMediaPC Case owner, I can safely say there isn't as much room as you'd like. I have the HTPC 200BA case which is nearly identical to your 5000B in size and dimension. While I do have a non-modular power supply in mine and it does fit, all that extra cable has to go somewhere. Initially, I stuffed it beneath my DVD drive and I believe that was what caused the drive to die on me.
Given the layout of the 5000B I can already see you'll have trouble with the power supply sitting directly behind the CD/DVD/Blu-Ray drive bay and not just from a cabling stand point (I'm assuming you'll place one in there eventually). There just isn't that much room for installation unless that drive compartment pulls out and if you have all the cables from a non-modular power supply sitting there as well, it just makes it that much more difficult.
Don't get me wrong. I love my NMediaPC case (once everything was installed) and I do recommend it, but if I had to start over again, I'd almost certainly go with a modular power supply.
Tecmo's is right though in that you don't need a 600 watt PSU, but if you can't find one of lesser power and still from a quality manufacturer, I'd go with your original modular.
My HTPC Specs:
NMediaPC 200BA HTPC Case
Antec SP500 Power Supply
Gigabyte GA-965GM-S2 socket 775 Motherboard
Intel Core2Duo E6600 CPU
Kingston DDR2-667 2x1GB RAM
Seagate 320 GB OS Drive
Seagate 750 GB Media Drive
LG DVD Burner
Sapphire HD2600 Pro Graphics Card
B-Gears B-Enspire Sound Card
Windows XP MCE 2005