It may take time and you'll have to be very lucky to find a Gen 3 - 3.5 that is as well maintained, and you'll have to get to know your new truck and it's habits. Having gone from an '01 Sport to a very well maintained Gen 3.5, I can say I do like the idea of the 3.5 over the Sport. What leaves me thinking about the Sport is the simplicity and feel of the 4x4 system, like you would get with a third gen XLS - LSD, 4 speed, mechanically-controlled 4WD.
I dislike the nanny features in my 2003 Limited, and I do not like using the sportronic shift to engine brake. Where the sport would power through 8" of snow with it's tight rear diff, with very predictable steering, the G3.5 is chattery and seems to fight me. I would seriously consider trading what I have for a very clean Sport like I once had - and this sport I liked so much had 242k miles on it, moderately maintained, and still gets driven hard every day by it's new owner.
Better still, I'd also trade for a supremely maintained and modified 2002 G3 XLS in black, blue or white.