I agree with those who've recommended Tirerack as an info source and possibly a place to buy tires. I have been happy with them over the years for info and have sometimes purchased tires from them.
I also recommend Consumer Reports. Their November issue always has tire test results, which are also in their annual Buying Guide book.
Most recently I brought General AltimaxRT43 tires from a trusted local garage. They are rated highly by CR, especially for snow traction, which is important to me. Tirerack has a tire buying decision questionnaire, which suggested these tires. And the local guys' mounted and balanced price was lower than if I'd had them shipped from Tirerack.