I've had/have both.
Get the frogg toggs tekk toad.
Very light, breathable, great neoprene cuffs and an awesome fit. They are fairly durable and each one I have had has lasted me a year (around 200-250 trips) of hard VI stream bushwhacking. They are very waterproof and quite easy to repair on the chance you do get a tear. Best thing is they are cheap! Can order one for around $60 USD.
The Amundson... bought it to try because I had a great discount.
The are sized terribly (I'm a medium in everything, and I had to go an awkward small). My buddy is normally an extra large and he went medium. The length in the small is way too short, but the body size and arms are ok for my size - you can't really win with the sizing. VERY durable - but I would never recommend one if you hike - you may as well not be wearing anything because they are not breath-able at all and you'll be more wet from sweat than rain. The neoprene cuffs suck and don't tighten up enough around my wrist (remember, I have a small - the smallest - jacket) to even bother with them - you'll get water down your sleeve tightened all the way or not.
Long story short, I'd never buy another amundson jacket, great discount or not. The next chance I get to go back to Frogg Toggs I will.
If you want something else to look into, Redington actually makes a good jacket. Kitty has been wearing one and it's been great. i think she paid something like $60 on sale. They had men's too, but I never picked one up and wish I had. No neoprene cuffs, but the cuffs still stay fairly waterproof. The are really light and breathable, and even have ventilation zippers under the armpits for when you are hiking.