I work in a bike shop so here we go...
First things first here buying a cheap bike from Wally World is a waste of time if you are even considering that route. If you already weren’t good for you. I have to fix these hunks of crap all day so just don’t do it. The minimum that you want to consider spending on a bike if you are even semi serious about it is 300~400 dollars.
Second do your research. I highly suggest that you check out
www.mtbr.com. They have reviews from hundreds of people who have actually gone out and ridden the equipment, an invaluable resource. Further they have links to most of the major online retailers. Next go out to the local bike shops and see what they have. Even if you choose not to buy the bike from a local retailer even seeing the bikes in person will help you make up your mind. Test ride as many as you can then you will begin to develop a feel for what fits YOU right, take the wife with you make her do the same. The employees at a bike shop can be a gold mine of useful tips and advice, listen.
I don’t know if you can even find bikes without suspension forks these days but in this price rage steer clear of them. They may seem like a good idea but what happens is that the manufacture engineers bikes to a price level and when a shock is added to the equation the rest of the bike suffers tremendously. Also any shock you will end up with will be a boat anchor, with two springs in it, no actual shock absorber, and absolutely no adjustability.
A side note if using a water bottle for “other” beverages have another one on hand just for water. Almost anything besides water will leave an aftertaste that you will never be able to get out of the bottle. One more thing, I can tell you from personal experience and I have the scars to prove it, be careful how many 12 oz curls you do before going on a ride. A couple of weeks ago I wrecked hard coming home from my friends 21st birthday for no apparent reason, but at 30 something I hope you have the common sense not to drink as much as I do (I’m only 21).
Happy trails and I hope you enjoy your experience,
Black Sabbath