I've got the Ruger catalogue in front of me now, as I've spent the day been mulling over whether to buy a No.1 for woodland stalking. They are a real joy to shoot, although you may need to go through some steps to accurise the rifle (see rugerforums.com for info). Personally, I love the look of the Ruger No.1, and it's simplicity. Also, as a left-hander, the No.1 is ambidextrous.
Bruce Potts reviewed the No.1A in Shooting Times a few months back, and gave it the thumbs-up. My local RFD is very sniffy about falling-block rifles, on the grounds of saleability second-hand, and the usual issue of fore-end hangers.
If you have the money, Dakota Arms make a stunning falling-block rifle too.