My mentioning of taking too much metal off the head, is per the belief that you will
1.) somewhat weaken the head (I've learned the hard way on that one), and
2.) You won't want to raise your compression too much, per milling the head much. I prefer lower compression, and more boost, as opposed to higher compression and less boost.
You also need to consider if (and how much) your block may need to be decked, and if so, what it will do to the compression ratio with milled heads too. Just something to think about ahead of time.
The last used set of stock heads I purchased, I got for $100, here in Houston. I've never seen 'em for less, but if they are available for $50/set, I think I'd buy a set to keep in stock...
However, I guess the real question should be --- why do you want to stop running the Wire Locks? Have you had problems? I've used 'em on my last two motors, with satisfaction and success! Just curious...?