Welder recommendations

Looking to get a new or newer at least welder. I know I want something gas shielded, or at least my son who is much more of a welder than I am said we need. For many years we have just used a harbor freight welder. We borrowed a buddies bad boy to put in the roll cage, that's when it became clear we needed to upgrade sooner than later. I want to be able to weld sheetmetal up to frames or steel beam. Am I needing more than one welder for this? Planning to get a decent torch as well. Would like to add a midgrade plasma possibly, but want to start at first with a torch and welder first. Any recommendations? Nothing 3 phase, my shop is a 200 amp service.