If you find you like the sport, I will reccomend goin single speed. Ive been riding single speed for 5 years now, and will never go back as long as my knees allow. The 29ers are pretty sweet too. Redline monocog is a great bike for a very good price. Full rigid singlespeed 29er.

Those bikes are
fast and tight in the turns. I just helped out a coworker who wanted to get into mtnbiking. A stright newbie, hadnt been on a bike for years. We went and looked at several models. Singlespeeds, 29rs, full suspension rigs, ALOT of bikes. He chose the Redline Monocog, and absolutely loves it. Just be sure when you are in the market, you look at all the options. Bikes are very personal Ive found. I personally love my Specialized. It was a great bike bone stock, and even better now.

Im currently building a Surly Karate monkey frame, and restoring a vintage singlespeed for my wife.
Motobecane is also a great company, as well as the bikes offered by Misphit Psycles out of Canada. I bought all of my drivetrain componants from them, Peter is a great guy.....Man I could talk bikes on and on... Almost more then knives!!

But Ive been a biker for longer then a knife knut.
If you do end up with the huffy, take it a small local shop and get it tuned up, and get a fitting done. A proper fit makes biking WAAAY more enjoyable, and guarantees quicker recovery times after rides, and makes the bike easier to controll. Plus, it supports your local bike shop which I am all for, and the smaller bike shops offer a wealth of knowlage on maintnance, local rides etc...I love working on them and building them. Its addicting.
Oh, and wear a helmet. :thumbup: