Generally, a 3000w inverter generator will be what you're after if you want to run A/C. If you like the idea of redundancy, many 2000w inverter generator options allow for pairing of two units to increase output. Some people also go that route because a 3000w generator isn't particularly light.
If you can live without A/C and probably the microwave, a single 2000w generator is plenty. You could possibly go even smaller if the maximum draw of your converter allows.
Popular brands are Honda and Yamaha. Many people, myself included, find the Champion inverter generators to be good value for the money.