Okay ideally it will be ridden on pavement to and from work (2 mi round trip) with the occasional hilly dirt terrain tracks that are local to my state. I would like the option of taking them to the Sierra nevadas, Rockies, smokies, etc. I am 5'11" 170 lbs and pretty athletic. I'm a 28 y/o Firefighter/Paramedic if that matters. I refuse to buy a pavement pounder because I just don't like them.
Ah, THAT is helpful. I would not bother with something designed around balloon tires like a Lowside then. A Monocog would be great for that, or an older XC bike would be ideal. That will allow you to venture into the woods quite a bit.
For riding a puny two-mile round trip, ANY bicycle that rolls and stops will work. For that short a trip, personally, I'd just as soon walk and save myself the trouble of locking up the bike and anything like that. I'd ride a cheap POS bike so I don't worry about exposure to theives and the elements.
If you want a bike that can handle real trails on actual mountains, a rigid SS budget commuter is going to be quickly overwhelmed under most mortals. It can be done if you have the cajones for that, but most people will want a stronger bike with stouter components.