You have a choice here. You can spend your money on weaker, heavier bike with a sub-entry level shock, or you can get yourself a durable and better equipped hard-tail (which will go anywhere a suspension bike can).
The smart buy would be the entry level models of a reliable brand like Trek, Specialized, Kona, Giant, Diamond Back, Gary Fisher, Cannondale... Just go to a good bike shop that only deals in bikes and bike stuff, and you'll end up with a good bike. Look 'em up in the yellow pages or 411