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Generally the greatest-return mods are, in no particular order:
Nut behind the wheel
Tire pressure
LRR tires
Grille block
Belly pan
Roof rack removal
Taller gearing
The nut behind the wheel is where you'll see the largest improvements, and the best way to do that is with instrumentation. Beyond that, a grille block and tire pressure are the easiest and generally cost nothing. If you need new tires, be aware that changing the size will throw off your speedometer. Also, be aware that ceramic brake pads will be more destructive to your rotors, though this might still result in a net savings if it can change driving patterns, as rotors are pretty cheap.
Getting rid of DRLs, and swapping over to HIDs/LEDs will probably disappear into background noise. Electrical load reductions will help in theory, but unless you're trying for an alternator delete, I doubt it'll make any noticeable difference.
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