Maybe consider a windproof top, rather than waterproof. It will keep some rain out, should breathe better than a waterproof, will definitely help keep you warm even when wet, and should be much cheaper to buy than a waterproof.
In my experience, Goretex - or other waterproof liners - are good for keeping feet dry-ish unless you get water inside the shoe (eg by going through a deep puddle) or are running through long wet grass (when the constant wetness seems to force water through the liner - it happens with walking boots too).
I say 'dry-ish', as lined trainers/boots tend to make feet sweat more and you can end up with damp feet anyway (I've just got a pair of Salomon Cross Max CS, which make my socks very damp even when I've not been near puddles!).
A pair of normal shoes plus waterproof socks can be more effective, more versatile and cheaper.