What dog would you pick?

Ok, here is a question. I am planning on getting a dog. But I'm not sure which type of dog would be best for me. So since I know many of my readers have pets, and you are an intelligent group of people, who better to ask for an opinion from.

A couple of facts first. I own a 2005 sq ft 2 story home. I have a small but fenced in yard. And I live within minutes of a vet. I'm single with no kids. I work from home a great deal, but occasionally do take business trips. And yes I can afford a dog. And I will get the dog once my carpets are all removed, so wood floors.

In the past I have owned Chows. I like Bulldogs, great character, but I don't think they can handle the stairs in the house. I hate pitbulls, dislike Rotweilers, and generally frown on small dogs. In fact I'm thinking of a mid-sized dog, of moderate maintenence. The climate in my area (Binghamton NY) is generally rainy, very cold in the winter, and moderate to hot spring and summer.

Given these facts what might you suggest, and why? I really would like to know. And once I pick my dog, I will have photos up for you all to see.