New Hong Kong MTB(DJ) Biker

Hello, I am from Hong Kong. I ride BMX, and recently want to get a MTB Hardtail.
The one I am looking for is single speed with 24" or 26" wheels (I would like a 24").
In Hong Kong, there is no dealers selling dirt bikes, therefore I got a very basic questions as below:
I am 180cm (5' 11), so what is the best frame size for me?
I am about to get the DMR Reptoid or DMR Drone, but I am afraid the size of the frame does not fit me.
Thank you for answering.
The one I am looking for is single speed with 24" or 26" wheels (I would like a 24").
In Hong Kong, there is no dealers selling dirt bikes, therefore I got a very basic questions as below:
I am 180cm (5' 11), so what is the best frame size for me?
I am about to get the DMR Reptoid or DMR Drone, but I am afraid the size of the frame does not fit me.
Thank you for answering.

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http://www.flyingball.com/
These guys sell Orange, Ibis, Santa Cruz, Yeti and Cannondale - all top class bikes, so can't believe there aren't more dealers. Hell most of the stuff is made in China anyway - must be someone selling stuff locally.
There is a Hong Kong Mountain Bike Association
http://www.hkmba.org/
Bike sizes vary between manufacturers, so I wouldn't buy one without trying it out.
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools