Personaly mate i wouldnt buy a second hand gearbox as more than likely it will start givin you the same problems, The best ebt is to get a gargage to remove the gearbox and them to recondition it for you and sort out what ever needssorting init, i cant give you a price as i had a new clutch fitted at the same time and a few other bits which came too 400quid but as i said i ahd other work done, but i would defo recommend getting it reconditioned and then it will belike drivin a new car mate, best money i ever spent, its suprising how much you miss reverse gear HaHa