I'm assuming that by FMU you mean one of the Apex'i units or something like that
6-8 psi, you should be more than fine
12-15, that's a little more towards the limit, but with appropriately sized injectors and a good fuel pump and regulator, an AFC would be adequate
The AFCs can do a great job in tuning a car, but of course they lack the precise control of a Hondata.
Of course, if you go with Hondata and some good tuning, you'll be running as smooth as stock.
IMO, go with the AFC and some injectors. You'll save money and you probably won't be able to tell the difference.