thanks for all the input. initially I thought Shell would be good ("who says no to Shell??") after all the intense assessment I had to go through, and moving somewhere would be a good way to challenge myself and start anew... but now am thinking I am so settled in Kuala Lumpur that it would be nice to stay. And I have great bosses and team it would suck to try settling in elsewhere again, bearing in mind I've only been back in KL for 10 months after 4 years in Melbourne.
money actually plays an important role. I suppose it would be different in western countries, where you have minimum wage and things are perhaps more balanced (cost of living vs salary) this is my assumption... you probably wont be RICH but you won't struggle. but for us asians, we desperately need as much money as we can get!
I just don't want to regret whatever decision I'm going to make..