I've been very impressed with my Powerlab8. So much so that I bought a second one. This unit covers all my models from my UMX micro planes all the way up to my 700 size electric model. The Powerlabs are the only chargers I am aware of that cover current range from 10ma to 40amps of output.
Below is my "large field setup", four Dell supplies and gives me plenty of power for the field and reduced the dependence on parallel charging.
Below that is the smaller 450 travel kit. One Dell 12v 550 supply and one Powerlab8. Up to six 3s packs in parallel at 3c each. For my smaller models, mCXP 130x and UMX planes I have a 50 watt laptop supply delivering 15v. I also use a 3s as well as 6s pack to power my Powerlab to charge the smaller packs. Works to have one charger that covers all my models and charging scenarios.
Server supplies are inexpensive and helps keep them out of the land fill. Not to mention they are very high quality, have power factor correction are often better performers that many RC grade supplies. If you don't want to put them together, you can get some plug and play supplies here.
Mark Forsyth http://www.rcgroups.com/forums/showthread.php?t=1563369
My first supply was from FeatherMerchant. I then branched out and picked up some supplies on ebay to play with. I've now wired and assembled several more for myself or friends.