Well .I'm stuck on whether I should go DIN or Yoke and do most regs come with a converter? CONFUSED!!!! .
The general flavor of response appears to favor DIN. I would support that. My first reg was DIN, most of my current regs are DIN. Therefore, I echo the recommendation to go DIN, IF the majority of dive ops where you will be primarily diving (? at home), offer DIN cylinders or cylinders with convertible valves. The suggestion to check in advance when traveling is a good one. While Andy is right - it is increasingly common for good dive ops to offer convertible cylinder valves - many are doing so when they need to replace a valve or cylinder, and I find that the change is coming slowly, at least in the western hemisphere.
If you go DIN, and need a yoke first stage because of travel, you have three options:
a) Use a converter: I am one of those divers who does not particularly like the DIN to yoke converter, for the reason stated - it pushes the first stage out enough to hit the back of my head, and I prefer my cylinder to be where I want it for trim, rather than changing the position to suit the adapter. I have taken one with me in the past when traveling to a 'yoke' country (e.g. Bonaire) but now I actually prefer to . . .
b) Swap out the DIN bolt for a yoke bolt, and the DIN wheel for an A clamp - I convert a DIN first stage to yoke for those trips where I know I will be using yoke. The conversion takes less than 60 seconds.
c) Have a second (yoke) first stage available and swap hoses from the DIN first stage to the yoke. I did this on one reg for my Bonaire trip in September. It takes a bit longer than converting the first stage, but is another option.
If you go DIN, you may have a little more flexibility when traveling because of the availability of converter. You won't regret the choice