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Also, I'm at a loss as to whether to get either a wedge for the mount first
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You need the wedge first, no point in auto-guiding unless you're tracking in equatorial mode.
Imaging at long focal lengths with the LX can be frustrating. Not sure about the Orion thin OAG, but I've seen spotty reports on that one. You would probably be better with separate guide-scope on top of the LX.
Regarding cables you need a GPUSB
http://www.store.shoestringastronomy.com/gpusb.htm and an RJ12-RJ12 guide port cable, Bintel stocks both. and some guiding software. (PHD will do nicley)
Bintel link to the GPUSB
http://www.bintel.com.au/Astrophotog...oductview.aspx