A better file manager for mac?

First of all I would like to apologize if this topic is already covered somewhere in this forum. But I am quite new for Mac and OSX and would like to ask about the alternative file manager solutions people may recommend. I don't mean that finder isn't accessible for me. It is very nice for common tasks, when you just need to quickly open something either locally or remotely. The problem with it is that I cannot find any easy way to switch between several finder windows. For example, when I need to copy a set of files located in different folders in one place, I would open a target folder in a separate window, then create a new window, switch to it, locate and grab necessary stuff, and copy it to the target folder. Besides, I very often find myself in situations when I would like to have several folders opened and switch between them. If it could be done easily with finder, then OK, I will just appreciate if someone would tell me how to achieve that. If there is alternative tool for that, please, let me know about it. Thanks in advance!