My brew buddy has an Amscope, and several other people I know. It's more than adequate for cel counting
and a decent scope for the price. I have an Omax, also a cheap brand. It's OK, but smaller than the Amscope, so the controls are a bit harder to use.
You don't need a digital to look at it on the PC. There are relatively inexpensive digital camera set ups that fit right on the eyepiece if that's want you want. As long as you've got decent light on the stage and around 400 power, counting is pretty simple. Identifying bugs is a lot harder, requires different stains and more magnification.
The quality of your hemocytometer wil make a difference too. Cheap ones work. More expensive ones are much easier to see cels on. Soemthing to do with the way the glass is ground I think.