If you're really serious, then I'd consider getting the "best" one you can afford -- which can get pretty expensive pretty quickly. The reality is that you probably need to be reviewing any cases on a quality scope, not a recycled med school class scope, and that's probably only going to be at the office. I don't know anyone who has and uses a home scope, unless they're consultants with a home office. I know several attendings who have their own scopes...just, kept at the office. I've -heard- of a few people who do, though.
Personally I think it's a good thing to keep work at work. But, for those who can take slides home (case slides you probably wouldn't be allowed to, if you asked the department; but study sets perhaps) and really want to at least glance them over and get some idea of what they're looking at or doing, old but adequately functioning histology/biology class scopes can sometimes be found for a manageable price, and lower quality scopes (usually unrecognized brands) of dubious utility. Just pay attention to what you're getting -- no sense getting one with the wrong magnification, etc.