[quote name='JoshTX']Thanks. I had a 20% off used coupon for GS and was just going to nab a used copy since this BB sale is over, but since the limited content sounds significant, I'll go ahead and look for an LE copy when I can find one on the cheap.[/QUOTE]
The non-BB exclusive LE (basically all first run copies of the game) included Argul's Tomb. Argul's Tomb wasn't a BB exclusive (it is also included in the BB version, though). The Best Buy exclusive adds the Angel of Death pack DLC, which, IMO, isn't really a big deal. It's exactly what you mentioned earlier - an early stat boost.
The Best Buy exclusive also includes a mini comic book (included full size in the Darksider II graphic novel) and a lenticular slip cover (which is the coolest part of the BB exclusive).