I would avoid mod gore tex clothing for stalking as it is very noisy - unless you know someone in the forces who can get you the new cotton stuff which is pretty much noiseless.
It is worth investing in goretex gear though as it really does keep you dry. Harkila, Swedteam Seeland all make good stuff which may seem intially expensive but will perform and will last for years.
Probably best to buy a light camo jacket (Paclite etc.) so you can wear it any time of year and just layer up underneath in the colder months.
Check out places like John Norris, Bushwear etc. for good sale bargains