Thanks for your quick reply, Brett.
I see the Resize to Fit but I don't want to have to set specific sizes - I have about 2000 images and they vary in dimension. When I run the batch program in Photoshop, it just down-samples and creates a smaller file, with thrown away bits, at whatever size the original is.
That's why I'm thinking I may have to continue using the Photoshop batch action to get what I want with the least amount of work/aggrevation.