I was wondering if there was a forex broker that would let you trade the us dollar / Thai Baht pair. I have not been able to find one that offered this pair.

Answer
No any Forex brokers that I know offering USDBHT. Most importantly, the fluctuation for this pair will be minimum comparing to the major, as such less people will trade.

What is the best forex broker who has cent account with 1:500 leverage, allowing hedging, and 10,000 lot size?

I'm looking for a Forex broker who provide cent accounts with the following features:
1- hedging on same currency should be possible
2- Leverage is 1:400 or 1:500
3- Lot size can go up to 10,000
4- reputable in trading and withdrawal of funds

Thanks

Answer
try www.gomarketsaus.com, they're very good