I've seen a lot of people trade up from the Safari to an Explorer, but I can't think of one person who has ever traded down from an Explorer to a Safari.
The Safari, no doubt, will find deeper targets in the trashy areas, but I doubt if the recovery time on the machine, or it's ability to ID deeper targets can match the Explorer SE. The Safari has FBS technology, just like the Explorers do, but so did the Quattro, and I believe the Safari to be an upgraded Quattro (faster processor, Pro coil, etc.). Even though the Quattro has been proven to find silver, no doubt, it was a much slower recovery machine than the SE, and it gave often-confusing mixed tones(high, then low), on the real deepies, where the Explorer would give a nice solid fluty high-tone on that same deep target.
HH,
CAPTN SE
Dan