Mears Transportation runs one of the more reliable cab services in Orlando. If you go to their website, they have a fare estimator. Sometimes it gave me issues when I used to use it at work - if it doesn't work for you when you put in your address, call Mears and ask them directly. Lynx will definitely be cheaper, but make sure you keep an eye on the time - some routes stop running as early as 11pm.
Water taxis come fairly frequently. I think it's about every 10-15 minutes. They're not really on a set schedule though. Basically, they get to the hotel, get everyone off, load everyone on, wait a second for any stragglers, then head on to CityWalk, get everyone off, load everyone on, wait for any stragglers, then head back and repeat. The boat lets you off very close to the convention center also, so that's a plus.
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