We've heard really good things about both Troyer and VMP and would recommend them to anyone. Their prices may be a little better on custom tuned programmers because they do a pretty good volume and the XCal is a little less expensive than the Gryphon. Overall though, I'd say the tuning is comparable between all 3.
Jack and Jeff covered the rest... 
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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