What Length Rounded IDE Cables For TT Tsunami Case??

I am getting tsunami, but need this question answered first!! Xoxide has 10" and 18" floppy and IDE cables. (The 10" are 2 bux more for a shorter cable, that is a rip off!! Grrr) So what length cables should I get for the mid size TT Tsunami case? Man what a sexy case..... HL2 deathmatch is out!! and It's awesome!

I dont know what the tsunami case looks like, but as long as its not like a server size, don't get the 18ers. I got them in my normal atx sized case and they are way too long