I did another test run last night with 7 gal of water - the water temp started at 63 and hit 150 in about 21 minutes with my pump recirculating the whole time. It was overshooting by a couple degrees, so I bumped up the set value to 165 and ran auto tune. After about 15 minutes AT finished and held the temps perfectly at 165 - I was impressed.
I'm glad I did the second test because I had a small leak at the thermometer that I missed on the 4 gal test. It was my fault because I forgot to use teflon tape on the thermometer threads, so that was an easy fix.
One other thing I forgot to share with others who may be drilling kettle holes with a step bit - wear long pants and shoes when doing it. If you wear flip flops like I was you get smoking hot shards of metal covered in lubricating oil flying off the step bit and landing on your feet (even at low RPMs). It's not a lot of fun.
Below is a parts list for the control panel and elements. I recommend not cutting corners on the PID or SSR and order from Auber (and not eBay) so you know what you are getting, but that's your decision. IMO, Home Depot has a better selection of electrical receptacles, plugs, ring terminals and cheaper wire/cable than Lowes, so if you have the choice I'd start your shopping at HD (YMMV).
For your more obscure parts (like resistors and cheap indicator lamps) you can nerd it up at Radio Shack. Just be aware that they will follow you around the store trying to sell you a cell phone plan - bring a big stick to club them with if they don't leave you alone.
I had a pretty good idea of what online prices were on stuff, so if I found things close to the same price I bought it locally, else I ordered online.
The list doesn't include the new kettle I bought, cable I used to run power from the house to the shed, breakers in the main panel, or any of the kettle upgrade parts I got from Bargain fittings, but I think it should cover most of the control panel and element parts. For more details on the Elecdirect parts, Ischiavo has a parts list on one of his threads that includes hyperlinks to most of the parts (it's a link in the 1st post of the thread linked here
Thanks goes to P-J for the original parts list - I just changed it up with some of the parts that I added or substituted.