my experience with goretex socks is they perform about as well as plastic bags in your shoes...When I would pull them off after riding, I'd pour out half a cup of dirty sweat from them so my feet weren't really staying dry...Plus, your shoes still end up getting soaked from the rain...
I have a pair of the MEC shoe covers (i hate saying "bootie") pictured above and they work well with clipless pedals but not so well with clips and straps...Sugoi makes a shoe cover that works a bit better with clips but I don't know how durable they would be longterm...