Asus P8Z68-V PRO Desktop Motherboard compatibility?

hello everyone new here   but can you tell me if this motherboard supports patriot viper tri channel ddr3 ram and will it fit in an antec 902 and does it support all graphics cards and can i put an i5 2500k in it my current speccs are

In the system now
Manufacturer & Model: custom
Type of Computer: Desktop
CPU: Intel(R) Core(TM) i7 CPU 920@ 2.67GHz Overclocked @4.0ghz(BROKE)  
Motherboard: Gigabyte (EX58-UD5)(MIGHT BE BROKE)  
Mem: 6141mb Patriot triple channel ram(Thats ok)  
HDD: 1TB (WDC WD1001FALS-00J7B1 ATA Device) And an Iomega 500gb(works)  
Video: ATI Radeon HD 4890 direct x10.0(broke)  

the pc is currently broken but i have contents insurance so im upgrading it. any one recommend anything these are the Upgrades i have in mind;

-----------UPGRADES----------
Asus P8Z68-V PRO

i5 2500k...is it better than i7 920?

Nvidia GeForce GTX 590

and a very good cooler...recommend any? i have a noctua cooler at the moment that use to cool an i7 overclocked @4.0ghz will this be ok for i5 2500k overclocked? might need a new one any way

will i have any problems with the new stuff im going to put in for example im not changing the ram so will it be compatible with the motherboard? and everything

thanks guys if you don't get any of the questions asked then tell me  

thanks