After one weeks' research, today I went to a meet with some senior photographers and ask their opinions on what camera I should buy and I got totally different opinions.
the first said Canon 1000D is not bad for a beginner.
The second suggest at least Canon 500D
The third one say for a serious players, I should go Canon 7D directly.
Finally one of my friends said 5D mark II is the only right choice.
After some struggle, I finally decided to get Canon 7D.
Now I've put an order at with 7D plus EF-S 18-200mm IS Len plus Canon Speedlite 430EX II plus a some cards and bettary.
The total cost is $2661 maybe still need to pay the GST.
Finally, the searching game is over. Now I can have a peaceful heart to wait my gears come to me hopefully, safe and in good condition.
Thank you all for give me good suggestions.