I've always built my own, takes a lot of time and effort and I never wanted to pay for the painless, too painfull to fork out that kind of money.
I'm going to try the EZ, been surfing here and it seems worth while. Lots of folks sell them, price is right and I'm not going for original.
http://www.noma.com/products_auto_sxl.shtml
For the type of wire they use GXL