A couple of things as I read the renewed thread.
1) Invest in a Lexar Card, it's what Marantz sez to use and it's the only one they'll accept as being error free if you have issues with their unit and need to talk with tech support. Since I made the switch from Sandisc.... 0 Problems! There IS a difference in memory quality, don't drag down a serious investment like one of these recorders and a serious pair of mics by hunting for bargains on the recording medium. It's no fun if you're worried about making it home with the show!
2) If you have a modded unit already I can't see any reason to run a preamp in front of it. I can't speak for the Busman mods but if you have an ACM or you are sporting the new Song Catcher all I can say is that putting anything in front of it will only serve to close down the image. You may change the tone based on the box that's in front but at a price. If it's tone you're after have fun in your favorite DAW in post! The Oade modded units with the pad can handle up to a +4dB signal so can handle a preamp in front or even a soundboard if you're so inclined.
3) Remember that the "AA" Batteries are hot swappable in these boxes. With rechargeables reaching such a high capacity and coming down in price AND having the ability to charger from a 12V supply you can run all day with 16 with only one trip or two back to the ride for festivals.
Have fun guys, it's a great little all in one package!!