I heard over on reddit that 32g doesn't last very long and that 34g was better but there's supposed to be a 33g out there that's all the rage right now.
I'm currently using 33ga Kanthal, since I don't have any 34ga. It is actually 33ga Kanthal A, NOT A-1. It does really great. 6 wraps creates a 3ohm coil every single time. 5 wraps is always 2.6 ohms. 4 wraps is 2.2ohms. I am very happy with it, but I think I still want 34ga, so I can get 3ohms out of 5 wraps. In a Mark-T(and probably a Chalice) having more than 5 or 6 wraps gets to be a tight fit.
I am definitely a fan of using Kanthal A instead of A-1. Kanthal A has less aluminum in it.