If you already got the budjet of Rm4K++, i suggest you get the 40D body only. Then buy a used 18-55 (non IS) kit lens, a lot of people sell this for around RM200. When you have save enough, buy the Tamron 17-50 and dispose the kitlens

If you buy the 400D body now + Tamron 17-50, then suddenly you itchy to upgrade the body to 40D, you'll loose a lot bcoz camera body's depreciate a lot faster than the much more stable price of lenses