One place not to skimp is the faucets. For typical home use (where you're pouring just a few pints a day) you really want forward-sealing faucets that will not stick. Standard faucets work fine in bars, where they are used all day and cleaned nightly, but they will stick something awful if allowed to sit unused for a day or two.
Also, make sure you buy 3/16" beverage lines, not 1/4". 8' ought to allow you a nice pour without excessive foaming. Just coil the excess and let it sit on top of your kegs.