One vote for the toaster oven
When you live alone, you are cooking small quantities - a toaster oven is a must have in my opinion. I have never owned a toaster. But as Alton Brown counsels, an appliance should have multiple uses.
I use my toaster oven almost every day for something or other. Roasted vegies. Nuke a potato, then 10 min in the toaster oven to dry it up a bit. Heat up leftovers. Microwave is good, but some things go better in the toaster oven. Bake 4 cookies (if you have cookie dough in the freezer, already formed into balls). Make a toasted sandwich. And of course it's good for plain old toast, including bagels. A toaster can only make toast and may not be able to handle bagels. A big oven takes a long time to heat up, and uses tons more elecltricity to do so. For me it's a no brainer.