Cdisplay is my reader of choice (technically the .1 unofficial build which came out after the author vanished), but a close second is mangameeya. If you like cdisplay but want something with a few more features & ability to have more than 10 bookmarks, mangameeya is the way to go.
I have tried most other ones available for windows, but didn't care for any of them. Some, like comical, were very slow & bloated. I only fired comical up 2 or 3 times, each time it took longer to launch the program than to read the actual comic. That's a slight exaggeration, but not much, it literally took a full minute (in contrast, nearly every other reader launches in less than 1 second). Others were decent, but just didn't have one or more features that I wanted.
Gonvisor is an interesting one. In addition to cbr/z files, it can open many pdf files (IIRC, it uses pdf2html to extract the images). It also includes the ability to resave comics (including pdfs ones) as a new cbr/z file. (In order to save cbr files though, you need to get the free commandline version of winrar & place it in the gonvisor directory.)