Printing best practices

I've been asking a bunch of questions recently on TS printing and realize that I should just start from scratch. Since I'm not sure what best practices are for this environment, I would like to get everyone's opinion. 

This environment:

20 Server 2008 R2 TS' and approximately 200 fat clients (mixed XP and 7). Currently, all network printers are installed on each TS individually (not shared). We also have about 10 USB printers that redirect. Our network printers are set up on 5 different local servers since we have multiple locations. We print both from local desktops and terminal servers.

What we need is for all network printers to be on each server like they are currently but I'd like to eliminate the need to manage each one on each and every server whenever there is a change. Our current environment was set up by previous IT personnel and I'm not sure if it's optimal

I understand there are multiple ways to deploy printers but I don't know what is best for our environment. I've tried Print Management but I need to be able to set preferences. I've tried GPP in Computer Configuration but it doesn't seem to work (possibly because of the current set up). I would like to know how others would manage the printers in this environment, even if I need to delete everything and start over. I am also inexperienced with servers and group policy so I will ask follow up questions to most responses. Sorry in advance!

Edit:To be more clear about my scope of knowledge- I know where the Active Directory and Group Policy Management reside. I have modified existing group policies but not made new ones. Since all of our changes always apply to all users/terminal servers/roaming profiles, I've never needed to create OU's or use any kind of item-level targeting so I am not familiar with those.