The first questions is: what do you need it for? The second is: do you really need it?
If you just want something to play around with, any of the $40 Amazon digital ones are fine. If you want it for doing board level repairs, forget about seeing it on the screen. I have the Amscope SM4TZ with the camera. The camera is really only good for taking pics...not much else. It actually gets in the way more than it helps.