If you're looking for more low end torque without spending a lot then gears are the way to go. They will effect your gas milage some, but not horribly. 3.73s are fine for a daily driver, especially if you do plan on adding a supercharger some day. If the supercharger is just a dream then go with the 4.10s. Now if you want REAL low end torque with essentially no effect on gas milage then add nitrous. You'll get lots of torque and you'll only use more gas when you need it, that is when you spray. But the rest of the day you'll get the same gas millage as normal. When it comes time to get your blower, a Ken Bell or roots type will give you more low end torque while a centrifugal blower like a vortech or paxton gradually kicks in but peaks higher and at a higher rpm.
Good luck!
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