One can never have enough power, and in even a small hobbyist electronics lab, one needs at least 2 supplies (to generate both positive and negative voltages simultaneously). The Power Designs supply that I first bought I liked a lot: fairly cheap on Ebay (~75$ shipped), 0 to 60V linear range (no range switching), has a max load of double its rated load and has a current limiting feature (important so as not to break your awesome devices under test!).
Just a quickie here to show you what I’m working on currently. Thanks to Eric, I now have a I2C/SPI/8080/6800 compatible monochrome OLED display! This is just a test to make sure the display works and that I got the correct pin-out for the SPI interface: