request for suggestions

I'm looking to purchase some library management software, and I was wondering what people use, what reactions they've had to their software, and if you have any recommendations and/or things to watch out for. I've heard good things about Library Master, but it looks like that only runs on Windows. I do run Windows on Parallels, and if the best software is PC-only software, I could go that route. But if anyone has any suggestions for Mac OSX, please let me know.

Thanks in advance.