I have a V4 kit with a V5 board that I was also thinking about upgrading. Comparing the two parts lists, some of the parts have been upgraded (caps rated at 35V, IC sockets are the dual wipe ones) and the Ethernet connector has a different part number.
New parts are: 16 - 47K ohm resistors, 1 - green LED, 1 - pushbutton switch, 1 - 1K ohm resistor.
Also need to get the new 3.3V regulator.
When I was checking parts on DigiKey, they didn't have the pushbutton switch I think.
When I was on the Mouser site, one of the shipping methods was USPS, but they didn't recommend it because they say it's difficult to track packages. The shipping estimator had the following statement:
"No Handling Fees
Orders shipped via UPS or FedEx are charged the actual shipping cost based on the carrier's rates. Mouser does not add any handling fees."
Funny they didn't mention USPS, but I don't remember USPS being available the last time I purchased stuff from them.
Has anyone tried to order from Mouser using USPS as the shipping method?