If you want to buy this watch because you think Navy Seals wear it--they don't.  If you would like a watch commonly used by SEALs, then buy a Casio G-Shock DW-6600.  If you just like the watch, it's okay, but there are better quality divers out there from Seiko and Citizen, and you should check those out.  When I bought my Luminox, there were some that were already broken in the case (tritium vials had fallen off the hands).  I sold mine a few months later.

2015 Update.  The Casio G-Shock DW-6600 is no longer in production.  Here are some other options:
Suunto Core Military Black: seems to be popular with the DEVGRU folks
Casio G-Shock GWM530-A1: I've seen this on the wrists of various SEALs, and USAF PJs.  This seems to be the go-to replacement for the DW-6600.
Timex Ironman:  First, the T53151.  This is a discontinued model, but you can still find them around.  I've seen this watch everywhere--USAF PJs, US Marines, USAF Pilots, USN Pilots.  Next T5E231: I've seen this on the wrist of at least one Hornet driver.  I'm sure other models and newer models are popular, too.

Bottom line: very few units have "issued" watches.  Many guys stick with G-Shock and Ironman.  Don't be a fool for marketing.