Honestly the cheap kits on "A" are good enough, stewmac makes / sells great tools, but unless you're going to make a living with them or truly go professional, I'd say save the money. I got quite a few of my tools from cbgitty and mgbguitars, once I got bitten by the cigar box guitar bug. Building one, especially if you go through building the neck, fretting it and doing the electronics really gives you a lot of respect for what actually goes into a guitar. I highly recommend it if you have the means, and you get another guitar out of it to boot!