How much do you fish?
Do you do alot bushwackimg?
Cheap/inexpensive waders will do for most trail walking but where you go a little further you'll put extra wear and tear on them.
Much like buying a vehicle...
Know what you want to do when you get them.
A Honda civic won't get you far off road even if it gets you there....
You'd be surprised what a 2 door coupe can go up in the right hands! (Went into a lake, buddy asked if I got my car in there and said "I'm impressed". He drives a tundra)
But yes there are limitations, make sure you get something that matches what you plan to do. Ie. Float tubes = breathable killers. Currently I am very happy with my simms headwaters. My freestones were also quite nice as I got a lot out of them before they got killed by a float tube.
What's your budget? The freestones are the cheaper option, I believe 4 layer toray while the headwaters are gore tex with 3 layers in the lower leg. The freestones I had were 2 models removed though.