I own similar, the Only problem with the Seaquest is the size - I have a medium so it fits my wet suit, but it won't fit over the dry suit. You can get a cumberband extender, but its still tight round the shoulders. If you get a bigger one - it probably won't fit either wet or dry.
Otherwise its brilliant for warm water diving with a wet suit & quite light for luggage allowance.
3 guage Cosole - they are heavy buggers even in the water!
Regs - go with what you feel is right. I have 2 lots of the ATX200s - brill. I know the 50s or 100s will do the same, but ... shiny
HTH - ANdy