What make and model microwave would be small enough?

Sleepy:
#1 They are speaking about COOKING watts, not the watts the oven draws.
#2 Microwaves are made up to about 3000 cooking watts, and draw about 21 amps
at 220 volts.
#3 The OP has limited space where they want to install the oven.
#4 Most appliances run on 110v and are limited to standard 15 amp receptacles,
thus, 1500 watts.
#5 If how much an oven can hold were the only criteria, oh, why bother...