Showerspass makes the most breathable, cycling specific rain shells you can get. But apperently they had a batch where the cuffs on the sleeves were made from water absorbant material, heh. There is a thread on here about it. Write em and make sure they have corrected it and you'll get the best hardshell raingear you can get, or used to be last i researched raingear.

Anyways, anything else from material such as goretex, hyvent, precipe, will breath less. Frog togs is from propore and is less durable but cheaper and breathes slightly less. Beware of anything made from a material that is manufacturer specific, since you wont be able to research even what the heck it is. (manufacturers just buy a material from someone and rebrand it in their marketing brand)

Hardshell raingear is also really only appropriate for cycling in temps below 45-50 degrees F. Anything above that and your going to sweat faster than it can clear. Try a windshirt if your in temps above that. Anyone who claims your going to be covered in sweat cyclign in temps below that, has probably never used anything better than goretex.

A softshell is also an option for rides of an hour, but they take a while to dry out, although they breath the best.