The guy that does the excellent Frets.Com site recommends the Fishman type under-saddle pickup. It's a piezo pickup and should handle both played notes and percussive slaps as well.
Some of the soundhole pickups are essentially electric-guitar pickups that require string vibration in the magnetic field... They sometimes don't handle percussive effects very well.
Here's the article:http://www.frets.com/FRETSPages/Musician/Guitar/Pickups/pickups.html
Check this out: http://www.dougyoungguitar.com/pickuptests/ (thanks to Roy from Cult of Lowden guitar forum)
Can give you an idea.
indeed ive decided to go with the pure mini as well. its got good low response, and it sounds great in smaller bodied acoustics.