Super Nova all the way. Never had a stoppage with mine, recoil is minimized because of the buffer system in the stock, the way the rails are designed, it almost pumps itself! It has no issues firing any different ammo, comes with 3 chokes and aren't that terribly priced if you find a sale (*cough, Cabelas right now, cough*). The only drawback is it isn't designed for small hands; I have some troubles reaching the safety, I need to move my shooting hand from the grip, which is a pain in the butt when a bird pops up out of nowhere. So I generally don't use my safety in the slough unless it's slung.
I used to have an 870 Express, but it's the cause of my personal boycott against Remington firearms. Had the gun for just over a year when it started having hard extractions on EVERY SINGLE ROUND. No matter what ammo, 2 3/4 trap to 3 inch birdshot. Short brass and long brass. Called and emailed Remington several times to inquire about their warranty and never got a response.