Very true lar your comment and I think this organiser quite noob lar... 

Maybe few months ago ppl use 6.12 lar .. nowadays where got ppl use 6.12 one.. 

name me one tournament (recent one) that uses 6.12 ...

you want help organise the tourney for your cyber cafe or not ? private messae me to contact me lar...

Bro you only have 3 choices lar:-

1. Version 5.84c/d (More elite players):-
- Most malaysians play this map. Bad point is there's a group of people who refuses to play this map coz of support for newer map versions. Also i think most people already know who are the people who will probably win the tourney.

2. Version 6.19b
- Good point is this map is one of the more stabler versions. basically i think if i'm the organiser wouldn't really wanna go use this map reason is becoz this map is neither here nor there. In other words ask yourself this question... you want to attract elite players or new team testing out their tactics?

3. VErsion 6.27b or Latest Version ( more teams testing out new tactics)
- good plus point for using this map is becoz it's new, here are a lot of untested tactics out there.
- You need to set a dateline to decide the latest version
- bad point is lots of bugs might still exist. So you will need more experience Dota Marshals around and make it very clear in your instructions what is considered as bug abuse and what is not.