They used paypal for a short time but had to switch over to Worldpay, and now I can neither deposit or withdraw via credit/debit card. Global Poker was good for me until they changed their deposit and withdraw method. Some other sites I've tried include Global Poker and 64spades. For example, intertops and juicy stakes poker can be played online in the US, but I have seen many complaints about not being able to withdraw if your address is US-based. I am also in the US and am constantly on the look for new poker sites available to us, the only problem with new sites or smaller sites is that you run the risk of not being able to withdraw your funds. As far as the best US sites for online poker, you already have the top 3 with ACR, Ignition, and BetOnline.