Yeah I rang around and found out about accessories. I managed to find an EQ6 (non-GOTO) for about $1300 including shipping, included dovetail bar. It was either than or a GOTO HEQ5 for the same price, so I went the sturdier mount ... giving up automation.
I've had my eye on this power supply:
http://www.dse.com.au/cgi-bin/dse.st.../product/M9940
Seems to have plenty of adapters, hopefully this will do the trick.
I can't see the SCP from the back yard but I have a digital elevation meter and will find myself a compass. Should be good enough for planetary shots yeah? Just spend a while setting it all up, then sit back at the laptop - then corrections every couple of minutes?