Join Date: Aug 2006
Location: Ann Arbor, MI
Bikes: Trek 7200 FX ('05), Trek 6000 ('07)
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I don't have experience with those bikes, but I know buying bikes at a sporting goods store like Dick's isn't the best idea.
When the bikes arrive, they are packaged in boxes. At an LBS (local bike specific shop) they are carefully put together by mechanics and tested to see that the frame and components are in good working order. At Dick's they are just slapped together as fast as possible at some ungodly time in the morning before the store opens.
When you buy a bike at an LBS, the shop will (and if not, request this) size you for a good frame and make sure the bike you want meets your needs. At Dick's they'll help you pick out a cool color...
Finally, your LBS probably rewards you for patronage by giving you discounts on accessories and often allows you to get discounted (or in some cases (as in mine! woo) free) routine service on the bike. Mind you Dick's probably doesn't even offer service.
Also, if you're like me, you'll find that once you get addicted to bikes, you start becoming friends of the people who work at your LBS. It is a great place to hang out sometimes!
However, if you do choose to purchase one of the bikes listed, you'll need to specify what you want to use the bike for. The Sorento isn't going to take much abuse on trails (even if you're just starting out). The Response Sport 08 is really the only "entry level" mountain bike there (and it isn't all that great itself for MTBing). If you're looking to get into the sport and start doing trails, you'll save yourself money in the long run by buying a good bike that'll last you a long time and won't limit what you can do once you get better at riding.