Gortex is "the poop", no doubt. Worth the $$$, if it's in your budget. I'm not AT ALL dis-appointed with mine.
Frog toggs are good for still activities....fishin, huntin. I can't say they wouldnt "flap" alot in the bike, but plenty of folks wear them. Feel similar to newspaper.
My last suit was about 100 bucks for Jacket (Parka), and pants from WalMart. The gf likes her Frog Toggs, bibs and jacket...35 bucks. It easily fits back in it's pack/bag....very lightweight... approx the size of a basketball.
THE BEST PART of my bibs is Velcro ankle straps (around the bottom of pant leg).
+1, fit over clothes..... think about how difficult to put on, on side of the road. Big pant legs to fit over boots, then tighten with (Velcro) straps to keep water from RUNNING up your leg on that forward control.
Remember, right leg is (possibly, come to think of it) near the exhaust..... Burnt hole....leak....etc. Maybe a set with extra padding/heat shield would be worthy.