Given a "new to me" used boat without solid repair records, I would change the impeller. I had one fail at 375 hours, almost four full seasons and it stranded me in the middle of the Broads.
Batteries depends on age and how you use the boat. If a dead battery could ruin a day of boating or strand you, then I'd change after my fourth winter. If you have several batteries, be more daring.
I never owned a boat long enough to have bellows problems. Six years seems like a pretty short life in fresh water.
As for alphas never heard any complaints. Bravo 3's on the hand have a big issue with corrosion even in freshwater. Make sure you check it well and put magnesium anodes on in place of the stock aluminums. Plus if you break a prop on a Bravo 3, it will cost you around $1200 for a new set.
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