I guys shown me both the 50D and 5D MK II. Of course the MK II is a much more fancy in term of full-frame capture and the processing of colors. The price is also twice as much. I did the trading on my existing 70-200 f4L USM lens that I bought over 2 years ago but rarely use. I got quite a good number as I bought it for 20,000 Baht and sold it for 15,000. I also traded my EFS 17-85 standard lenses for 9,000 Baht (I bought it for 12,000 but heavily used it.)
Anyway, I bought back my Canon 5D Mk II, 100-400 f4L IS USM and a 24-105 f4L IS USM lenses. Now my set is perfect. I have two cameras as I wished for with lenses to cover from wide angle (10-20) up to 400 mm. The only thing that I don't have is the art in taking photo. My next move is to attend a photo class workshop. Too bad for a weekend spending lots of money on this little hobby of mine.