Get the 15.00 PSU tester from FrozenCPU.com, I bought it and that thing kicks ass. Feels very sturdy and seems to accurately test all the PSUs I have hooked up to it. The store and myself are both located in upstate NY (4 hour drive from me) but I ordered it at 6:30 pm the previous day and it got to my front step quick next day. You guys wouldnt be dissappointed.
FrozenCPU ATX 2.0 Power Supply Tester (20/24 pin ATX, SATA, P4, Xeon, PCI-E, Floppy, 4 pin) @ $14.99 http://www.frozencpu.com/psu-165.html
This one looks really nice, should be able to test anything.