Any of the town car companies approved by Orlando International Airport (check their website for transportation information) would be equally reputable serving the train station. You could start with this board's sponsor, Florida Tours.
I sent you a PM, not sure if you'll get it due to your first post. If not, let me know or send to my a personal e-mail in my profile address. I'll let you in on to who we use, we use Amtrak all the time, over 20 trips via Amtrak.
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