Thanks for the info Daz, much appreciated.
I went forked out $69 for one of those Hercules 12v wrenches, I reckon it'll do what I want & if it doesn't well I'll worry about that then.
Sounds like from what you said that the driver may be the way to go, the type of work I'd do would be lighter stuff so the driver may be a more appropriate option.
Thanks everyone.