While I was also a noob and got mack into it a year or so ago, it does not take long to get "match fitness" and improvement comes quite quickly. I got a GT mountain bike fro Torpedo7 and it has been good. There are quite a few decent brands out there worth looking at. Size is also important. It has to be big / small enough to be comfortable to ride. I have a 24 in cheapy here as well and while it rides and works well the brakes are hopeless, so I would suggest disc brakes if you can. A reasonable new bike will cost $600 or so, but they can go much more.
I am sure there will be lots of suggestions as to which are best / better / worse.
Bike Barn is a bit of a warehouse arrangement but I have heard good things of the Merida Brand they carry. Other brands that used to be good (Not sure if this has changed or not) would be Giant, GT,. Not sure about others but I am sure there will be help along shortly.
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