Thanks for your suggestion David.
I've had a look at the Orion 50mm MiniGuider and agree it seems like a good package.
I guess what I'm trying to achieve is to get something that I can not only use for guiding, but also let me get my toe in the water with imaging with a 'scope and the ST 80's seem to fit the bill.
First up I'm going to see just how good the DSLR set-up is without guiding, It seems like I should be able to get up to two minute exposures with a very good polar alignment with PHD. Just need the clouds to go away.
One thing I have learnt is not to waste a clear night.
Cheers
Kev