I would totally agree, Netter's is great, and it (sort of) fits in your pocket, so between cases, before cases you can look through it. Gives you basic info on the approaches as well as great tables with origins, insertions, and innervation, as well as little anatomy pearls. Well worth the money...
I wasn't suggesting anybody go out and buy a Hoppenfield's either, but I got lucky and have a free copy from a connection that works at a publishing company. It's too big to take with you (unless you carry a book bag or something), but it's good to read the night before if you know what cases are coming up and you can get a free copy/check it out from a library, etc.