You can get started with US$50, trading microlots for US$0.10/pip.
An account with US$500 would allow you to safely trade minilots, for US$1.00/pip.
To trade full lots, you'd best have US$5,000 in capital, and you'd be trading for US$10.00/pip.

You are in UK, based on your handle here? You want to look at http://www.ig.com/ as your broker. They are solid, reputable and handle European customers. As an added bonus, there are no taxes for Forex profits in the UK at this time, so you keep every last penny.