G'day Brett,
An OAG is definitely more fiddly than a guide scope but I don't think it would be impossible for you to figure out.
I have a couple of Astrodon OAGs (
http://www.astrodon.com/products/hardware/). They are good but not inexpensive.
These guys have some more affordable OAGs:
http://www.teleskop-express.de I think there are a few people on IIS using these ones.
Cheers,
Rick.