I'm in the market for a new boat also and as far as I can tell from reading and talking to people you can't go wrong with a Lund (rivet), Alumacraft (rivet) or Crestliner (welded).
I have an Alumacraft and it's a solid boat. I fish the Mississippi and hit stuff all the time

...with no issues to the boat....can't say the same about the motor!

Lund is King up here and is obviously the premium quality boat. I've never heard anyone complain about their Lund...and I see plenty with some significant dents! I would have zero worries about the rivets, they have been in service for a long time in some really tough conditions. They use the same process as aircraft rivets.
I'm probably going to end up with the Alumacraft Competitor 165 Tiller. It will handle some of the bigger water on Lake Pepin but still be easy to launch by myself.
I don't have much issue with my bow moving in the wind (I have plenty of weight in the front when I'm fishing!) but I do get some stern swing if I don't leave the motor down. I would invest in a couple of "drift socks" aka "sea anchors"...amazing results after you learn how to use them!