Long-term forex trader here, and I am currently looking for...

Long-term forex trader here, and I am currently looking for a good broker that has the best possible leverage for me. How much leverage can I get in ThinkMarkets? Also, will there be any differences according to what pairs or what instruments I am trading with? I know that using leverage can be very risky, but it does help me in the markets. Besides, this is not my first rodeo, so I think I will manage.