There are several ways to withdraw your money. Often you will be able to withdraw fund with a bank transfer or cheque sent at home. Bank transfer is often cheaper and faster. In the Netherlands we have iDeal which lets you instantly deposit from your bank account and then you can withdraw with bank transfer.
Bank transfer/cheque withdrawal can also be combined with ClickandBuy. ClickandBuy makes funds available to the poker room by authorizing them to withdraw money from your bank account.
You can also use Neteller or MoneyBookers which are both supported by PokerStrategy.com. I think that you may even get a bonus from PokerStrategy.com, just look it up on the website. The advantage of MoneyBookers and Neteller is that you can easily transfer funds between poker websites and other online businesses. I'm not familiar with MoneyBookers, but the disadvantage of Neteller is that you have to wait a couple of days and the same probably applies to MoneyBookers. Also Neteller is not supported by much businesses except for poker rooms and online casinos.
If you have $600 in your bank account, the easiest thing to do may be to use ClickandBuy to deposit $600 and simultaneously withdraw $600 from another poker room. Then you'll get the money a few days later while you can keep playing poker.