I'm not interested in a MSAR, a pre-89, or a USR.  It'll be an A3 or a TPD.

Any thoughts on which way to go?  Multiple barrels and a registered sear will be in my future.

Thanks!

TDP only made about 140 AXR, AUG clones and they went under 8+ years ago. So the Steyr is your best bet. The A3 isn't made anymore, but the A3 M1 is current. Only difference is the receiver and how rails attach. You can get a scoped model w/ either a 1.5x or 3x tube. Or a short, long, extended flat rail.

A3 M1, 16" barrel, extended rail, OD green AUG stock

That is a nice setup.  The 20" barrel and factory 3x are nice too.
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Something about those phrobis m9 bayonets on bullpups just looks good. I put mine on my x95 sometimes :).

Early M9's look great on anything, but I like my Eickhorn bayonets the best.

Are those m7 pattern or something?

No, Eickhorn is an old German firm, which began producing a modern Knife Cutter Bayonet (AR-15 compatible) based on the AKM bayonet when OES and Nederlandsche Wapen en Munitiefabriek jointly developed the KCB-70 for the Stoner 63A weapon system.

The basic design has undergone several revisions... KCB-77, Bayonet 2000 (adopted by Canada), and Malaysia adopted a version in 2005.

The USMC was all set to adopt a variant of the Bayonet 2000 (MOLLE sheath, no wire cutter), but lobbyists for the US blade industry pitched a fit. The contract was cancelled before the 50 T&E units were delivered and OKC won the new contract. The OKC-3S is an inferior bayonet in my opinion.

Anyway, here's a KCB-77 on my AUG A2
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The "L" tab on the bottom is a bottle opener.

http://worldbayonets.com/Library/Articles/eickhorn_kcb_70_article.pdf

A3M1 AUG with old school M7 Bayonet mounted at a 45* offset.  I did it like that because with the lug at the bottom on the 16" barrel you can't fold the forward grip up.  I may get a 20 or 24 inch barrel in the future and will go with a regular 6 oclock bayo lug.