If he wants the *most accurate* then TM is the way to go for sure. He should understand there is no such thing as a free lunch though. I've personally paid people to build armor for me (especially clones) and while they come out 90% done, there is always a small amount of fitting that still needs to be completed by oneself. Also TM can be very expensive depending on the exchange rate too.
If TM is out of reach, then pretty much any TE derived armor should be fine (AP, TE2, ATA, etc.). Since they are all reverse engineered form the same ROTJ tour suite and all have been modified to some degree since, I'm not sure to what degree one wants to disputes the accuracy differences, and in my mind things like seller reputation, material, price, etc. become more of the deciding factors.
Again, if money is no option you simply have to advise TM.