I'll try to give more on this later, but I am almost out of time today. I've recently used ORCAD, looked at workbench but not used; Used PADS (new company now), used PROTEL, and EAGLE for PCB layout. So far, Protel was best overall for an engineer, mainly because it has more easy to use features. Pads and ORCAD are both good but both stink in library management, with PADS being 10 times better. If you are not locked in yet, I suggest you take a good look at Protel along with the other two. They announced over a year ago that they were working on a better library management system. ONe thing about Protel is that the component list is set-up as a spread sheet that can be modified to give values, footprints, and other parameters using Excel and then put back into the schematic all at once. This is much worse in Orcad.
One other thing you might consider. Orcad is the oldest and one of the best schematic capture packages. PADS (cadence?) is one of the oldest and most versatile PCB packages and can use Orcad for its schematic. Four years ago, my designer claimed that that combination was by far the best soulution he had ever used. As an engineer, and one who only works with board layout every few months, I find that intuitive is much better for me than versatile. I don't have time to learn where everything is each time I do a new board, and that is the case with Orcad and Pads board layout programs.
Well, enough for now.