I will second Lamdas as great starting supplies. I got a couple triple output LPT-7202-FM models. Sure, they have analog meters, but they are faster to note a change with (slower to read the exact values). They are very solid, and silent save for a hint of hum. I have one of units with two of the three supplies wired for auto-tracking so I get matching voltages for use as positive and negative supplies for op amp circuits. They are floating ground unless you connect the earth ground; so no ground loop worries. I got mine for around $35 plus shipping. I think they each had a broken binding post, which cost 20 cents and ten minutes to fix. The prices vary a lot, but if you look around you can often find them cheaper, or make an offer. Remember, you are getting three supplies in one. If they don't work, or put out less than rated current, I can tell you which capacitors you typically need to replace. Easy, through hole boards.
I also have one Acopian dual supply, which is nice, but having a single meter for volts and amps for each supply is really annoying, and possibly dangerous to your circuit. You want it on amps when you are testing things, but you also want to see that you have the volts set correctly. I would highly recommend your supply have a separate volt meter and ammeter.
You will really end up wanting at least two or three supplies, possibly more.