[redegg]

There are dozens of exchanges. None of them have the liquidity to make my time there worthwhile.

Doing your best at security is not good enough. Bitcoinica is a good example of this. You'll need to make sure everything is locked down, or the day when you announce to your users their funds are gone awaits.

Ability for users to easily get funds in/out of your exchange is a must. If you choose to obey AML laws, your users will curse at you for making their lives miserable. You're going to be stuck with bank wires/LR because accepting ACH is a ton of risk.

I either go on Mt. Gox for day-trading or Coinbase for buying/selling.