I enjoy biking around, now i wanna buy my own....?

You should look into getting a used mountain bike. Craigslist is where I get mine. They usually are a little out of tune, but nothing you cannot get fixed at a bike shop or a place like that. Or, if you like to be cheap you can fix it yourself. Brands I recommend are cannondale and specialized. You can easily replace the tires also. Go to www.bikenashbar.com and their are all sorts of parts for bikes there. I would recommend for tires a cross between mountain and road tires. I call them hybrid tires. I forget what the actual name is, but they are not made for bumpy trails but if you decide to go off road for some reason these tires can handle them. Happy riding.