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Hi comp pistons - educate me

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I am looking at installing a hi comp piston in my son's 2010 crf250r.  From the posts I have been reading here, it seems like JE pistons is the way to go.  My question is which one, the 13.8 or the 14.2?  I believe if I run the 14.2 I would need to run race gas to avoid detonation, correct?  I would like to be able to run pump gas for practice and run race gas at the races, will the 13.8 and/or the 14.2 allow this.  Also looking at going with the hotcams Stage 2 cam.  I know there are better options available, but I would like to keep the cost of the piston replacement and cam replacement to $500 or less.

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