I've done several and prefer the American Auto Wire, that is the best handsdown.
Painless isn't and it'd be the last one I chose. A clue is the advertising policy, those that advertise the most need it and you see thier advertisements everywhere.
One very big consideration is the turn signals, the ez wire, rebel etcetc kits will have the turnsignals built into the fusepanel circuitry and require modern steering column or you'll be playing master electrician tring to integrate a signal-stat add-on turnsignal switch into a system that isn't designed for it.
Don't toss your dash lamp sockets, they are much better thn any modern sockets - like in the AAW kit - you just need the bits and pieces to utilize them. But the current aftermarket dash sockets are horrors - don't use them.
