Tohtruck- Though I was the one who initially suggested the Buzz One, I did so because it looked good on paper for the purposes that you initially stated. It might not be appealing to your eye, but you did admit that after riding it, it felt better than the Felt that did catch your eye. Enough said on that subject.

You mention that your sister's boyfriend used to be into mtbs and suggested you consider that route. You know something? If you trust him, then his advice is going to be worth a TON more than that from strangers on these boards. He'll be able to go with you to shops, help judge the fit, possibly even give you tips on basic maintenance. Keep the knobbies for snow or any trails in the area, put slicks on for the streets and sidewalks.

With your height, stick to models with 26" wheels. Hardtail with lock out on the front fork is what you should concentrate on. He'll know (or should know) what those terms are. Maybe he will help you check out the local CL offerings and look over them for you, but I'm assuming he knows a thing or two about wrenching...