Welcome aboard lonewolf04422.
Lots of the guys on here use smooth bore shotguns for deer hunting. My best advice is to replace the bead with a Hi-Viz or TruGlow for seeing it better. Also, watch and try to get your rifled slugs on sale. Pick up a couple boxes of different brands and do some shooting to see which brand your shotgun likes the best. Then stick with that brand for deer hunting.
As far as the Pardner Pump goes, I have handled a couple and my nephew bought one. The quality to price ratio seems good and I don't think you could go wrong. I don't know about the Excel. As far as the follow up shots is concerned, you would be surprised just how fast you can reload that single shot with some practice. I only own singles....no pump or auto for me....but that's just me. Keep in mind, for the price of that pump or auto, you could get quite possiblly one of the most accurate rifled slug guns on the market. A Tracker II goes for $139 at Gander Mountain...that's with open sights. About $50 more will get you an Ultra Slug with the heavy barrel...no sights, but drilled and tapped for a sight base which I think comes with it as well as the offset hammer spur.
Good Luck with the deciding.
Cookieman