Driveshaft Strength ?
I agree with badsport. Peace of mind comes with a well built drivetrain. You can rest easy if you put in a very strong driveshaft/u joint combo. Im going to have about the same level of power and I dont want the driveshaft coming at me through the floor!
I have heard mention of an outfit called Denny's driveshafts. Supposed to be indestructable,but Im sure it's big $$!
http://www.dennysdriveshaft.com/
Did a quick read there and they offer a free replacememnt warrantee if you ever manage to break it.