The never ending battle for superiority between Texas and California has emerged in this thread, but thank you all for the great comments.
For posterity, I will summarize the advice I have received so far.
*Take him to a PBR showcase to get published numbers (thanks DESERTDUCK, NYCDAD, and BASEBALLHS)
*Contact a local junior college coach for a workout and feedback (thanks CABBAGEDAD)
*Post a highlight video to this site and let the hsbaseballweb.com community evaluate him (thanks CABBAGEDAD)
*Find a top recruiting-oriented travel team with coaches who can make an informed evaluation (thanks PABASEBALL, RJM, JCG, SMITTY28, MIDATLANTICDAD, et al)
-suggested San Diego teams: GBG, CBA, BPA, SD Show, SD Stars, Trosky (3 votes)