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For a hemi I used Modern Cylinder Head (they cnc'd mine). FHO does really good work too. Barton does good work, but I'm not sure if they CNC them or not. 
My Indy wedge heads I sent to Dwayne Porter. He does them by hand and does great work.
I know Modern also CNC's pretty much any wedge head too and I've always heard good things about the results.
Still don't understand why some people just have to have their heads done on a CNC machine. A GOOD head porter that does them by hand is just as good. The CNC program used is no better than the hand ported head that was digitized to make it anyway.
I'm a machinist and programmer for over 20 years now( aerospace and medical/ not engine ).
The positional accuracy and repeat-ability from a CNC is EXTREMELY hard to beat. I can see someone going in after the CNC and doing some minor touch ups only. 
That's true, but a good hand porter will make sure every port is as close as possible. Having heads CNC'd is cheaper sometimes, depending on who you go to, that's the only real plus to me.
My point is about the people who immediately cross a porting business off their list to potentially do business with simply b/c they don't CNC them.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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