It may not be the advice you're looking for....
But I agree with Insight: if you're considering spending that amount of money on some of the mods on your list, I would instead start watching for a more efficient car.
But to your list:
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Power Steering Delete- Not sure how much this is going to cost.
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I don't think you'll find a shop willing to do this for you. And the Camry has
very heavy steering minus assist. (I wouldn't drive one without it for convenience/safety reasons.)
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New Hi-flow Cat- Around $600.
Modern exhaust- $300- $900 I reckon.
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Neither will help your mileage. At the low RPM eco-drivers tend to operate their engines, your factory exhaust has enough capacity.
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Manual transmission swap- Around $2500 (yikes), car was never offered with a Manual transmission which is why the swap is more expensive than normal.
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A manual is one of the best things you could have to improve milage (particularly urban), but $2500 is getting into the range where you can find a different 4-cyl manual car!
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AC Delete- I hardly use it at all so it's mostly just dead weight.
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Can't argue with removing dead weight. But its impact is relatively small, pound for pound. So if you're paying someone to do the work, you'll likely not see a reasonable return on investment.