For $1000 there are a lot of bikes to choose from. I would suggest staying away from any full suspension bike under that price though. There have been some very good deals in the $12-1500 range but 1k and just under are generally a very big sacrifice. Hardtails are a great way to get into MTB and see if you really like it, what type of riding you really like, and what you want or need out of your bike.
I would recommend you check out some of the local bike shops and start talking to the guys there and see what they recommend. Find a place where the sales people are knowledgeable but also friendly and willing to just spend time talking with you about the different bikes they have.
There are a lot of "hybrid" and "cross" bikes out there right now that are very capable but are a mix of road and light trails. If you are seriously thinking about getting into MTB stick to one labeled as a mountain bike. The standard 26" wheel is being considerably replaced by the newer 29" wheels. Larger wheels are faster and roll better over obstacles. I don't particularly like the feel of the 29" but that is something where a decent test ride of both wheel sizes will be something you need to check out for yourself.
With your budget I would recommend a hardtail in the $500-600 range. Maybe even up to $700 if there is something just around there. It will get you out of the entry level components and into some better feeling drivetrains, wheel sets, and suspension forks. A great entry level bike can be had for around $400 but if you have the budget a small step up in price can yield a much more enjoyable experience.
I did a quick search of your area:
Petersens - They carry Felt Bikes. The Six series looks decent. The Six70 and Six80.
They also have Rocky Mountain. I didn't see pricing but perhaps either the Edge, Flare, or Vapor might be in your range just based on the builds I saw.
Gerks - They carry specialized. They should have a ton of bikes to check out from $400-700. definitely a good place to check out as well. I have several specialized and sold them for quite a few years. They will probably have the same model with both 26" and 29" wheels. A great way to get a feel for the different sizes.