I have an aluminum boat also. It's a '95 Crestliner Eagle 22 footer with cuddy and walk around. Aluminum boats are great, light,easy to tow... I like mine, but don't think for a minute, just because they're aluminum that they're trouble free. There's a lot of things to be aware of before buying one. Most have wood floors, if it's over 15 years old chances are the floor has some deterioration some where. If you have to replace the floor (like I did) it's a major job.
Welded boats sometimes develop cracks (like mine did) and leak and weld repairs aren't cheap or easy, usually. Riveted boats get stressed rivets and can leak, too. Leaky rivets/seams not an easy fix, usually.
Then there's the other Achilles heel of aluminum boats, the transom. Yep, just like the floor, most are made of wood. Many over 15 or so YO have been exposed to water damage, and wow, another expensive/ time consuming repair. Imagine that. So if your wood deteriorates, you lose structural strength and then you have a cracked transom, (like mine did?)too. Some things to look/watch for if you own one or are buying used! Good luck in your quest.