Yes, the 99-04 Sunsetter LXI is supposed to be the best all around boat in this category. When I bought mine I researched both the best I could and decided I could get more for my money with the Sport Nautique. I think a comparable Sunsetter to the 01 your looking at on SIA will cost you 4-5 K more. We love our 99 and I can't imagine the Sunsetter being that much better for the money. Ours has the factory tower and ballast and really works well for everything. If you have the opportunity to demo that boat I think it is definitely worth your time. These boats are built well and very solid, the GT-40 is a great engine as well
I recommend determining what options you want on your boat and what total cost will be in the end to set it up that way. Tower, racks, tower bimini, perfect pass, heater, travel cover etc. You could easily spend 6-8k adding all these to a boat or you can look for one that is set up the way you want it. The one on SIA looks like a very nice boat and if you don't need all the extras and could buy it for 15k I think it is a great value, even if you add a bunch of these options over time and keep the boat long term then it is still a good value imho