Mongoose XR250 26'' Mens Mountain Bike?

Hi i'm wondering if this is a good bike and you would recommend it to me? This is the link. http://www.sears.com/mongoose-xr250-26inch-mens-mountain-bike/p-00630216000P?prdNo=1&blockNo=1&blockType=G1 . I will use this for riding around my neighborhood and the park .. My park ( balboa park ) its huge and... show more Hi i'm wondering if this is a good bike and you would recommend it to me? This is the link. http://www.sears.com/mongoose-xr250-26inch-mens-mountain-bike/p-00630216000P?prdNo=1&blockNo=1&blockType=G1 .

I will use this for riding around my neighborhood and the park .. My park ( balboa park ) its huge and has little hills and stuff and will take this camping. I'm 14 years old .. Would you guys recommend me this? Please if you can, give me some pros and cons on this bike .

Also I like this bike its from Titan? http://www.sears.com/titan-white-knight-21-speed-alloy-all-terrain/p-00653822000P?prdNo=1&blockNo=1&blockType=G1

If you guys don't recommend me these , please tell me a bike you would recommend me only from sears.com though. I'm willing to spend as much as $400 maybe 500 if its top quality . Full suspension would be nice and disc brakes :) ANSWERER WITH MOST DETAIL GETS BEST ANSWER! :)
Update: I CAN ONLY BUY IT FROM SEARS SO NO MORE POSTS SAYING "DONT GET IT FROM SEARS" GOSH
Update 2: I have a $2000 sears gift card so IM ONLY BUYING FROM SEARS!
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