nail clipping requires a lot of patience, and takes some time to perfect. I've been a bather at petsmart for a few months now and I'm only now really comfortable with nail clipping (of course I've got to get them pretty short in one go). Just find a style you're comfortable with and take length off a little bit at a time. I have no favorite brand, but I definitely prefer the plier style.
As far as dremels go, do yourself a favor and only use them to finish. No dog will stay still if you intend to dremel the nail entirely because for long nails the friction will cause heat and it will be painful for them. Take some length off with the clipper of your choice and use the dremel to round off any sharp edges.
Personally, I use the smaller nail clippers (the ones suggested for dogs sized from chihuahua to cockerspaniel) on all dogs, even weimereiners and labs. I like the level of control they allow over the large dogs clippers (which in my opinion handle as well as hedge trimmers).