I'm not in South Florida, there may be some good local shops that you can support there, but you'll want to ask around. As for parts the most honest people and by far the most knowledgable have been the guys at heeltoeauto.com. They can do price matching as well so hit them up.
As for power upgrades and bolt ons, from what I understand most restrictions on power in the TSX are in ECU, CAI, and the Catalytic converter.
Look at getting the ECU reflashed with Hondata. I haven't heard many people going with the s300. Most people Reflash for the bang for buck. If you intend to modify cam advance, intake manifold, and fuel delivery in the future, just go with the flashpro.
As for power gains there are some helpful articles out there. This being one of them.
Upgrades I'd recommend are Comptech icebox CAI, fastline catback, unorthodox pulley kit, Hondata Reflash. ??
https://www.hondata.com/tuning_k24a2_tsx_engine.html