If you get a modded ToUcam then you will need to make sure you have a parallel port on your computer. Seriously though, think about getting a DMK or DBK if you are not getting a ToUcam. I've used ToUcam (900 and 840), DMK, DBK, DSI, LPI, ATiK along with a few others and I keep coming back to the ToUcam because it works first time everytime.
I've been drift aligning with K3 for about 5 years now and 99% of the time I used a ToUcam and I've never had a problem finding a star whether I was using an ED80 or or an 8" SCT (which is not needed by the way, you can get just as effective alignment with an ED80 as you can with an 8"sct). The ToUcam can be an issue if you want to autoguide and don't have anyway of adjusting where your guidescope points, but add a Focal Reducer or use a DMK/DBK and you are set for both worlds.
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