thanks everyone. Another I am looking at as a guidescope is the skywatcher 90mm mak :
http://www.astroshop.com.au/products/details.asp?id=MAS-065A
Are there any considerations that I should be aware of between choosing the mak over the shorter refractor? Is there, for example, any benefit to the longer focal length of the mak? Are the maks heavier, or harder to mount / balance etc?
Adam