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yeah go to pinkbike.com
good brands are jamis, trek, cannondale, kona, i think khs, rocky mountain, specialized, i think scott is good, and a few others
Definantly go for a hard tail, best to just learn on. i just got into it this summer and I got a novara ponderosa, with a couple of upgraded parts like the cranks and handle bars for $350, which was a steal looking back at it. But things I've found that i would focus on when buying a bike for a first time, is rear derailleur, and brakes. after that or i would look at forks, wish mine was a little softer than it is. But when you purchase a bike get a comfy seat (saddle) for you. In my opinion its like boots when skiing, your but will be hurting on a long ride. But that thing has taken me everywhere with little complaint. hardest ride i've done with it is a 22 mile climb up 3,500 in elevation.
so look around and look for a good deal. But the components are way more important than the frame shape and look, but still make sure its your size. And definantly do alot of research on derailleurs and the pyramid of it so you know what your looking at.