I am an amateur photographer, and I want to buy a SLR camera that suits me, mainly because it is cost-effective, and it doesn't matter what I look like.

In fact, about 4000 SLR cameras, there is not much room for choice. Nikon D3000, Canon 450D, Pentax K-x (single head), Sony a330\450 almost 4500. Of these three models, I personally recommend K-X.

But I suggest you increase your budget (for example, save money for a while), because the mainstream of 5000 yuan gear is similar to Canon 500D, Nikon D5000, Pentax K-x and Sony a550. And the cost performance is actually higher than 4000 files. Recommended 500D, quoted around 4700, including cards and some accessories, more than 5000 can be obtained, is a classic cost-effective entry machine. K-x double head (18-55+50-200) is also a very affordable choice.