I'd recommend the SX3, I love mine. Lightweight, low recoil, lightning quick, & just plain fits me - I've never shot this good! Mine even cycles the 1 oz loads, though the manual says it won't. I've been very impressed.

I was looking at the SBEII because it's very reliable because it is inertia driven, but decided against it for the same reason - inertia driven shotguns kick more than their gas driven counterparts.

Also beware, these guns you listed, the rifled barrels tend to be very cashy - like $400 or so. I wanted to do that also, but didn't, not when I can buy a dedicated slug gun for that price.

Just my 2 cents, but fit is more important than brand. I know guys with $100 beat up shotguns that can outshoot anyone I know, just because their guns fits perfect. I'm now a firm believer that fit makes the shooter.