I've been thinking about it, and I have decided that a gear swap is likely in the near future. My problem is, what would be the best bang for the buck, and what are some recommended sites to check out for the gears? I currently have the 3.55s, Non LSD. I was thinking of going to 3.73s, but I'm worried that I wouldn't feel the difference.

 

I wish Ford made a 3.91 for the 9.75", but they don't, so I'll say go to a 4.10.
You'll notice the difference ;^)

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4.10 or 4.30 depending on how much highway driving you do. You wouldn't be able to feel a big enough difference with 3.73's to justify the costs. What engine/axle do you have?