|you've also stated that you want damn near the best hardware, at a very low price.|
sorry buddy, but there's a little give and take there, just like everything else in life.
actually, it's even MORE important with electronics NOT to buy El-Cheapo models. If you buy a cheap kitchen knife, what's the worst that happens? it's hard to cut with. Buy cheap RAM and a cheap Power Supply, though, and your system will crash frequently and damage all other hardware components.
"blu-ray and HD must." - you mean you want blu-ray and HDDVD? HDDVD is a dying/dead technology, why MUST you support it? Also, optical drives are easy to hold off on and upgrade later, if you want to lower initial costs and sink a little more into the build later.
2TB HDD - that's a bunch of space. if you're trying to save money, here might be once place to scale back.
Good Graphics Card - well obviously
7.2 Sound Card (Good Quality) - again, if you have a decent motherboard you could start with onboard audio to lower initial costs, and install a soundcard later once the system is up and running.
Antec1200 gaming case/or alternative - almost entirely user preference. Will you be using the Power Supply that comes with the case? this is typically not a good idea unless it comes from a highly-respected power supply manufacturer like Antec or Thermaltake. You didn't mention a Power Supply in your list, so i hope you're not planning on cheaping out here: That's one of the single biggest mistakes custom builders make. Even if the system boots up and appears stable, dirty power could slowly be damaging other expensive components. It would be a shame to save $150 on the Power Supply, only to have your motherboard, CPU, Hard Drives, and RAM crap out in 6 months because they have been running with sub-optimal power.
Card Reader - not much experience here. they don't seem to vary in quality as much as things like RAM and Power supplies.
Firewire and loads of USB's - makes sense...
Lots of Ram over (8gbs) - I have 4GB of RAM in my 64-bit Vista gaming machine at home, and have never seen it max out. I suspect 8GB will be overkill. If you're buying DDR2, it's super cheap now and i guess you'll probably grow into it eventually. If you're going with DDR3 i would scale back to 4 or 6GB for now, since the hardware is more expensive. RAM is also a component you don't wanna cheap out on. Stick with well-known manufacturers like Kingston or Corsair. It would also be to your advantage to see if the motherboard you select will support the brand of RAM you are considering.
Webcam - sure, why not
Games (what ones) - that's really more of a personal question. I recommend Number Munchers, Crysis, Tetris, or Left 4 Dead.
And A Windows OS. - get Vista Ultimate 64-bit. It's the more expensive OS option, but no 32bit OS supports more than about 3.5GB RAM, and WindowsXP 64-bit was crap with zero driver support for anything.