Welcome to hell.
I've tried and struggled on any number of approaches, including
lazertran, inkjet printing on to the smooth side of sticker sheets in reverse and rubbing them on (oh matron!), and ultimately the best approach I have found short of sending stuff off to professionals (like trophy makers) to do is to print on to heavy duty mailing labels, stick them on and then cover in a couple of clear coats of clear coat goop (known in the trade as CCG).
For example, an amp I did:

Better than dymo labels, not a patch on sending off to professionals, but at least it is darn cheap - just the cost of the label and the ink and the CCG. One problem is, you're limited by the fact that you can generally only print to A4 size and 19" is well, 19"
I have been keen to try etching an enclosure, a la
http://www.diystompboxes.com/smfforum/i ... ic=85803.0 - some really awesome stuff here.
At the end of the day, I find that you get what you pay for, in which case it becomes a case of what you are trying to achieve. If you're trying to impress clients, you invest in sexy faceplates. If it's strictly personal use only, then it's a case of whatever works for you.
Good luck! (Muahahahahaha)