Omg,please help a newb with a new build

Ok,im upgrading from a p4 yay!
This is my second build ever,today I nagged a 1090t sitting comfortablly in a crosshair iv formula with a coolit eco a.l.c watercooler,not what I was after but I got a good deal on the package......sooo now what...

I was thinking about mounting the radiator on the rear 120mm exhaust,simplly because the hose isnt long enough to reach anywhere else. I'm using a massive p4 alienware case with top mount psu....question is can I use the radiator and psu fan as the only exhaust? It has 3 80mm intakes and 2 60mm fans on the ram cooler. Can I make it work?

Next question I have a rosewill rx750 extreme psu brand new sitting in a closet for a year with all the modern goodies like sli and crossfire. Is it enough? I hear its crap will it explode...should I even bother?

Total specs are like so;
cpu-1090t might mildlly oc it maybe 3.8ghzish
Harddrive-velociraptor with a wd black 2tb down the road
Fans- 3x80mm
Cooler- Coolit eco a.l.c watercooler
Gpu- dont know yet something modest maybe crossfire..sugestions?
I run 2 asus dvd burners
I have 32 bit os kicking around so im thinking 4gb max 1600, probablly 1333 but down the road might go 64 bit at 8gb

I got 1100w in a random psu calculator..sounds high doesnt it?

Anyway if the rosewill is trash what might you gents recommend for my needs?

Light gamer;witcher 2 on med-high 40fps is good, Diablo3 on max........

Forgot to mention stupid tight budget

A picture is worth a thousand words.
Heres a pic of how short the hoses are and a picture of a tower identical to the one I want to put it in

You may want to swap the rear exhaust fan over to make it an intake to pull (hopefully) cool air through the radiator.

Problem solved had to buy a new case ended up with a haf 912,great case lots of mounting options for radiators and punch outs for hoses. When those 7 120mm fans come on I know I made the right choice lol

Thanks for the help