If your Generac is still working, just keep using it. Any 4-stroke engine is good for 1000 hours if you change the oil once in a while. If it's too noisy, just buy a better muffler. I used to use an old B&S powered generator that came with nothing but a spark arrestor, not even a muffler. The thing would give you a headache if you were within 100'. I bought a lawnmower muffler, which improved things, but still wasn't quiet enough. Then I picked up a scrap yard
car muffler from some little compact and piped together an adapter. The motor thread was 1" NPT, so all I had to do was add a 1" to 1-1/4" adapter and nipple, slide the nipple into the muffler and add a little stove cement and a hose clamp. Problem solved. Nice and quiet. Cost me about $3 to fix the problem.
If you are going over 1000 hours, spend the $4k and spring for a diesel. If I run a genny over 6 hours a day in a power outage I'm watching a lot of TV. My current genset is propane, just to simplify fuel storage, but I also get the advantage of better engine reliability. I figure it is good for 200 days of power outages at a minimum.
If your microwave has a chintzy power supply, I can see it having trouble running off of a generator,
but any toaster oven should run fine. For coffee I just put a kettle on the wood stove and pour boiling water through a filter cone.