I am interesting in picking up a Mossberg 590A1. The 18.5" model with the ghost ring sights has caught my eye. Basically I want this for combat shotgun matches and for throwing lots of slugs and buck. I have a pair of 870s (20 and 12), but am not thrilled with the fact that my 12 sometimes fails to eject. I know it would be cheaper to get a barrel for it though, but I am very familiar with aperture/ghost ring type sights from rifle shooting and think I would get along well with a shotgun so equipped. What is the general board concensus of the 590A1? Worth the price premium? (I'm assuming I'm going to have to order it in.) Other suggestions?