Welcome to the site,
@miss katie!
I agree with the suggestions that a relatively wide solo canoe in the 15–16' range, such as the
Northstar Northwind Solo mentioned by
@Alan Gage or
Hemlock Eaglet mentioned by
@Bob B., might be ideal for you. Another model you should consider is the
Wenonah Wilderness: it feels very stable and has a lot of volume, so it makes good solo tripping canoe for a beginner or for someone who prefers to paddle from a sitting (rather than kneeling) position, and I think it would be very suitable for someone on the heavier side. Wenonah offers several other models with similar specs that might work well for you, too—in particular, the
Basswood Solo,
Prism,
Moccasin (discontinued), and
Solitude (discontinued) could be worth looking at—but I haven't paddled those and so can't comment on them from personal experience.
On the used market, some of Mad River Canoe's solo models (e.g. Courier, Guide, Independence, Traveler) may also be worth considering if you happen across one (though they aren't the lightest canoes out there, and their shallow-V bottom is not to everyone's taste). I own an Independence and have paddled a Guide a few times, and both are fun, friendly canoes that I expect would easily carry you and your camping gear.
I also agree with the suggestions that renting would be a good way to try out some canoes to get a feel for what you might like...but finding an outfitter that rents solo canoes isn't always easy! Some paddling shops host demo days where you can try out a variety of canoes, and if you call ahead (say, a week or two before), they might be able to ensure that a model you're interested in will be available to paddle, so that could be another way for you to try potential options out.
I don't have an opinion one way or the other on the 17' Alumacraft, but if you plan to paddle solo, a solo canoe will probably give you a better paddling experience, and if you get it in Kevlar, it will also weigh much less (many are <40 lb).