Mother board Help, Help pick Graphics card, Liquid cooling questions!

Alright, im doing my first build, for a start my dad got me a thermaltake sopranoRS on boxing day for $30, but now it turns out that the case is way to small for my build. Go easy since im only 15,
My specs are-

-Asus P5N-D ATX Motherboard
-Intel Q6600 Core 2 Quad
-Thermaltake Ruby Orb CPU Heatsink fan.
-8GB Ocz SLI Ram
-(x1)1TB Seagate Barracuda(Slave)
-(x1)500GB Seagate Barracuda(Main)(buying next week or so)
-LG Securedisk DVD/CD Burner(main)
-LG LightScribe DVD/CD Burner(Slave)(Buying next week or so)
-2 Cold Cathodes
-Nexus Venus Cold Cathode and 3 Fan controller (3.5)
-(x1) 120MM Thermaltake Fan
-(x2) 90MM Thermaltake Blue LED Fans
-Ultra X3 1000WATT PSU(buying next week or so, i had an OCZ 600WATT PSU but it was Weak for SLI so i put it in my dell replacing a 300watt psu)

CASE-COOLER MASTER HAF 932.(Buying next week or so)


Graphics card options-

XFX GeForce 9800 GTX+ Black Edition Video Card (I will be running in SLI)
*Tiger Direct link- http://www.tigerdirect.ca/applicat [...] P450-98440

BFG GeForce GTX 260 OC MAXCORE Video Card- (I will be Running in SLI)
*Tigerdriect link- http://www.tigerdirect.ca/applicat [...] ku=B52-261


Motherboard Questions-
I went to a computer store and the tech guy said that the P5N-D is not good for running the GTX 260's in SLI, But i post here becuase I dont trust that guy. He wanted me to buy some motherboards from his store and was insisting alot, so me and my dad left.
SO IS MY ASUS P5N-D GOOD ENOUGH FOR THE SLI OPTIONS I PRESENT?

Liquid Cooling Questions-
I choose the HAF-932 Becuase it is a full tower which is ideal for water/liquid cooling. I would like to liquid/water cool my CPU(Processor), and my GPU'S (I will be using SLI). I just would like to know if the following are good enough-
Cooler Master Aquagate Duo Viva (for DUAL GPU)
Cooler master Aquagate Max (For CPU)

If you have a better setup in mind please post it, and im not looking for a $1000 liquid cooling kit, lol, im only 15 and this PC is being built with my own money, i have enough but would like to also be smart with it.

Now im a total N00B at liquid/water cooling so is that a good setup? And how the Heck is the Cooler Master Aquatage Duo Viva powered?, is it PCI?

Thanks!. i know its a long post but just bear with me

I got the Q6600 In january, so it seemed good at the time, i would also like to get into overclocking and heard it was a good processer to do so, i bought the 8GB sli ram becuase it looked cool and for the price it was a bundle! $50 for 8GB..lol My monitor res is 1280 X 800, ive had my P5N-D since February so i'll run with it, this PC is not always going to be used for gaming, probably just for a year or so, then ill give it to my dad with a 9800GT SLI or w/e is in date by then. Thanks for the help guys!, keep posting i like hearing feed back!

For a low resolution such as that, an HD4830 or 9800GT is plenty.