yeah...janeway is the definitive book on immuno...but kuby makes things easier. it's a lot more coherent and definitely much easier to follow. Here's a link on Amazon...i see it's out of print. , but it's 4.5 stars.
we're using the janeway book now (one of my instructors said it was "simplistic"...then again, he has a phd in the field. i would hope he thinks it's simplistic!). i really like the book, but if you want something that's a bit easier to understand, the BRS for micro/immuno is also very good.
janeway one of the most lucid introductory texts i've read to date. parham doesn't include nearly as much information; but if you don't particularly care about that it is a reasonable alternative [a lot of the figures are replicas]