Get what and how many you want that makes you happy. I am lucky that I have a partner that is supportive of my hobbies and I am supportive of hers. That being said, I don't want anything more than I can display in a visually appealing way. I currently have 4 built lightsabers (real parts Luke ANH, Vader ANH V2, Vader ESB and, of course the jewel, Obi-Wan)...the only one I may try to build in the future is a Luke ESB. I could honestly thin it down to just the ANH Luke and Obi and be pretty happy though.