Thanks for the opinions guys. I've moved away from the Instinct and now it's down to the Titan LX or Mares Abyss 52.
From what I can tell the Abyss is a damn fine reg and I'm starting to lean that way unless the weight difference is a big concern - I'm trying out the abyss in a pool this weekend so I'll see if it feels too heavy. Anybody have experience with that? The 2nd stage is about 100g heavier than the Titan and I don't care so much about that from a travel perspective, just from a whether-it-feels-too-heavy-underwater perspective....from what I can tell that's the only potential downside and I can't afford to go with the Carbon. I'm sure they're both amazing breathers, so from what I can tell it's :
Mares Pros: all metal, rugged, superflex hoses, no adjustable controls (as a photographer I've got too many other settings to worry about)
Titan LX Pros: Lighter, Auto-closure ACD system
Package prices for either of these regs is the same at my LDS, so price difference isn't a concern...
this is my first major scuba purchase besides camera equipment so I'll want something that can grow with me and last for a long time. Very excited to get one before my next trip (curaçao in April) !