Broker Recco for quick gamble?

From the trusted list of brokers that will accept Americans, could someone give me their opinion of where it would be best to open an account for one play where I can make an aggressive trade that should last about 7-14 days. Looking to deposit in the 5k range, and if the trade works out make around 15 or so. I’m not concerned with spreads or any normal trader issues. Just want to make a bet, hit them and get paid, or lose. So I guess broker integrity is my most important qualifier.

Thanks in advance.