Hey guys / gals, I'm getting back into biking and thought I should stop by here before I purchase a new mountain bike. It's been years since I've ridden a bike and plan to use my purchase for exercising too. I was thinking light trails, pavement riding, possibly some rocky trails and even joining in on some of these "bike parades / coalitions" I've seen around the city (about 50 to 100 cyclist being escorted by police through traffic... looks like fun

The only problem is I can't decide on two possible options, and the truth is I can't tell what the difference in quality is. Not looking towards spending $700 to re-introduce myself to this hobby (Not yet... maybe after a couple of years). But ultimately... I do prefer QUALITY!
Please Help... And be brutal

My two options are;

"Diamondback Sorrento 2011" - http://www.diamondback.com/bikes/mtn...l/sorrento-11/

From Sports Authority for $330

http://www.sportsauthority.com/produ...entPage=family

**************** OR ****************

"Genesis V-2100" - http://genbikes.com/mountain/Genesis_V-2100_white.php

From Wal-Mart for $165

http://www.walmart.com/ip/Genesis-V2...-Bike/16685814

At double the price the only difference I see are weight and suspension. What I can't figure out is the Genesis so different in quality that it justifies it being half priced?
What about the weight of the Diamondback (about 25lbs) being almost half of the Genesis (about 45lbs)... does that justify the price being double?
Is there a difference in the parts? Below is a set up of the specs to be easily compared side-by-side (with notepad or word) if it makes things easier

THANK YOU SO MUCH!! EVERYONE!!