Figuring out what size tower I'll need.

First Post, Hi Everyone.

Ordered up a new system last night, Everything except the Tower Case. This will be my first, ever system I've put together & the only thing I'm concerned about is that my old Tower won't be big enough for the new parts I've ordered, spacificly for the MB & the CPU Cooling. What I have atm is a NZXT Guardian: Zylon Bought it off Ebay Pre-assembled about 4,5 years ago.

Ordered parts.

Gigabyte GA-X58A-UD5 Motherboard Rev2
Intel Core i7 950 CPU
Prolimatech Mega Shadow Deluxe CPU Cooler
Yate Loon 120mm D12SM-12 Case Fan X2

EVGA GeForce GTX 460 1GB External Exhaust SuperClocked
Corsair CMT6GX3M3A2000C8 6GB (3x2GB) Dominator GT DDR3
Corsair HX-850 Power Supply

& some other odds & ends.

With everything I've ordered Plus shipping & a new Monitor I've well over exceeded my expected Budget. So If anyone can recommend a Cheap Tower that will easily fit the parts, I'm not too concerned about aesthetics just need something that will fit it all, that would be great. - Indeed, If I knew specifics about Tower size, MB dimensions & the lot I wouldn't need to ask, but I'm totally in the dark. Plus I live in a remote area so I can't just go into town and ask.

Any & all help would be totally appreciated, thanks.