PI swap and gears. 3.73's will be plenty of fun and are more streetable than 4.10's IMHO <flame suit on>. You'll probably stay about the same on fuel mileage with 3.73's.
The PI swap is a MAJOR upgrade. Nominal results with a tune are 260-280rwhp with just stock PI heads/cam/intake. It bumps your compression to 10:1 though so you'll end up with at least 89 octane needs and maybe 91 if you get a tune that's more aggressive than stock.
Since I haven't done this in a while... a 5.4L swap would wake the hell out of your car. Massive performance increase. Right Saleen S330?
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