My favorite freeware aircraft is OzWookiee’s Grumman Goose, and it’s not too small… maybe a nice one, if you are used to heavier planes now,
… and it can land on the water too
You could also go official TBM-930, try this addon for it, really very nice mod,
On that page, there’s a recommendation for G-3000, so it would give you a nice garmin… but I’m not sure about its status atm, it cost me some FpS when I installed it. The Mugz addon also works without it.