In answer to your questions:

1.  Yes it will be a problem.  The XMP profile is for only 3 slots populated.  The latency will increase for 6 sticks and if i recall correctly the speed will decrease as well.  You will most likely have to manually overclock it to achieve optimal ram bandwidth.  You may have to goose the voltage a bit.  Please note that while 1.65 volts is considered the limit you can go over it slightly. Just be sure to know what you are doing and research everything before bumping it.  Check kingston, hardocp and other forums to see what other users are doing as well.

2. nice case BTW...This case has the PSU on the bottom so i would think it wouldn't be the standard airflow that i would recommend which is One Front (in), One Top(out), One Rear(out).

For your case i would experiment with One Top (in), 1 rear (out), 1 front (in) and check your temps.  Then i would move the top fan to the side panel (in) and check your temps to see which one works best.  A lot will have to do with the type of CPU cooler that you are using.  I wouldnt bother putting 2 in the front since you aren't loading it up with a stack of HDD's. 

If it was my system i would get a 4th fan and arrange them:  front (in) top (out) side (in) rear (out). For another $15 you can just do that arrangement and not mess with testing.

Nice system and good luck!

j

Good luck bro, let me know how it works out.

You definitely have a handle on overclocking so you wont have any problems.  There's definitely more settings these days lol.  Heck i just use the auto-oc feature for my mobo, it's easier and im lazy about it lol.

Just curious what OS are you planning to run. I know I built my Rig with 8 gigs of ram total. But thanks to the Vista OS and 32 bit system I came to a very nasty realization that I had much more ram than my OS could ever manage to utilize.

It is a mistake I have learned from and will not ever repeat again. But as to date I have found no work around to the problem.

I just got the CoolerMaster HAF 922 (fantastic case - also bottom mounted PSU which is nice) and the stock cooling is front 200mm intake, top 200mm exhaust, rear 120mm exhaust. I don't really see why you would have to change it just because the PSU is on the bottom.

Sounds like a good plan. I could do the same with mine, actually thought about mounting my other 120mm in the bottom but I don't really think I need it (instead of on the door blocking the view of inside).

Just gotta post pics with it all assembled.

Never listen to a sales clerk, if they knew anything they wouldn't be working as a sales clerk... (no offence to people working in sales)

I would highly recommend you go Win7 64bit, you'll find it a massive upgrade from Vista and you'll feel the benefit of all that RAM.

about the ram question.....i guarantee you if you call kingston, they'll tell you to set it to xmp and let 'er rip. you may have to manually set the voltage to 1.65, tho. i bought 2 kits of corsair dominator and set them to xmp and had no issues. i did rma them to corsair because they wouldn't sell me a set of blue heatsink fins, tho. they wouldn't sell me the blue fins but they'd replace my 2 kits with a single kit of the same amount of ram with the blue fins. the single kit cost 80 bucks more than my two kits of dominator so i was happy to do it. same memory but blue fins instead of black.

Why would you get a caviar green? They are slower than the Caviar black and for a game system, you want a large cache and high speed. You're not trying to minimize power consumption.

Edit: Oh, nevermind. Too late. At least you're being nice to the environment. I hate the way they market those drives, right alongside the much faster caviar black.

I thought the exact same, mybe he can send them back for some Black's?