a good quality toaster/convection oven preheats much faster and saves a LOT of energy over a conventional oven. But, one should emphasize "good quality." There are a lot of really crappy toaster ovens out there that don't do anything well. If you go with a toaster oven, get a good one. I have an Avanti Elite (I can't remember but probably cost me like $150), and I use it 100 times as much as my conventional oven (which I rarely use...maybe for a turkey??).

an electric kettle (again, good quality is a must) is also essential, imo.