As far as I can see you do not need a FET that BIG, look at using a 'Fetlington' 2n7000 (15c here). Also if you are going into a parallel port, I assume you are using a PC, what about using the 5v from the PC supply?
(Did you see this earlier post of mine, actually I picked up the last one from the UK.)http://cnczone.com/forums/showthread...ght=heidenhain
Al.