Quest Central for DB2, while it does include database administration, is more for performance monitoring/diagnostics. If your looking for a tool from Quest that performs database management you should be looking at Toad for DB2. This product has a customizable look and feel and offers functionality for database administration as well as database development. You can download a trial from http://www.quest.com. Also, Toad for DB2 is licensed per seat rather than per server which might fit your monetary needs more closely.
Please feel free to shoot me a line if you would like any additional information. I'd also be happy to set you up with a web demo to show the features and functionalities you are looking for.
Jason