best route to chiang mai

Dec 28, 2007
Heading up to chiang mai from phnom penh, cambodia next week (as soon as the fridge is empty and the new year hangover has passed) for a month of loops. Will be crossing over via koh kong, can you please advise the best route up, avoiding Bangkok, there looks to be a few different options, so i would appreciate some advice.

Have a great new year and keep it shiney side up.