Here's the deal... unless you can spend some money on the bike, don't get full suspension. Cheap suspension is hardly worth it. Plus full suspension means alot more bike maintenance. Forks and Shocks needed to be overhauled etc. Costs money. Plus suspension (bobbing up and down) adds resistance. You will work harder, go slower, than others on regular road bikes.
If you plan on riding trails, or something like a rail to trails, then consider a front suspension/hard tail. I would look at a good steel frame which will offers some comfort.
If your plan is to ride on streets or paved bike paths, don't do suspension at all. Get a road bike. Remember mountains style bikes are made for off-roading and don't have the easy rolling ratio a road bike has. It will be harder for you to peddle a MT bike than a road bike down the street.
For the road bike, depending on the money, try and get a good steel frame. It will offer some comfort and reliability. Stay away from aluminum! Consider used. Lots of good used bikes out there as people are always upgrading!
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Private docent led mountain bike rides through Limestone Canyon. Go to
letsgooutside.org and register today! Also available: hikes, equestrian rides and family events as well as trail maintenance and science study.