In the acoustic things I've seen with him he uses a combination of built in pick-up and a regular mike directed at the guitar neck/body (best of both worlds really).
In that respect he uses acoustic-electric guitars - although expensive ones which are great instruments to begin with.
Any guitar can be retrofitted with a pickup-system - under saddle, piezo element inside the guitar, built in dynamic mike, a regular pick-up - or any combinations hereof. If you take a great guitar and have a pick-up system added, it will still be a great guitar. Conversely, adding a pick-up system to a bad guitar does not make it good - only louder...
Which guitar you'd want to check out depends on your wallet and personal tastes. Personally, I like Takamine guitars for lower to mid priced guitars. Sturdy and good sounding.
The best thing you can do is to go to a well equipped and reputable dealer and try out various brands and models to find one that suites you. If you find one you like which hasn't got a pick-up already built in, you can always fit one later. Just remember to add the extra cost (approx. $100 and upwards) to have one fitted.
Its simple math really - the better the guitar is to begin with and the better the pick-up system is, the better and more natural sound you'll potentially be able to achieve. Depends on the sound rig also, of course.