The smartest way to do it is use a credit card and place say $10k in there. Trade with it and every 30 days draw it down and then the next day make another deposit.
That way if they screw you over and collapse, you can get the credit card issuer to stop payment.
lovely system and you also use 0 of your own capital.
I recommend GFT for security and professionalism also.
IG Markets and CMC seem like toys compared to the big Forex providers like GFT, FXCM (probably the best software), or FXDD.
GFT have an australian office and Australian support and they have been around alot longer than the others.