Quote from Rhody Trader:
I can understand wanting the security of exchange trading, but if you think that you can get better liquidity and lower spreads through futures, you're totally off base. No market is more liquid than spot forex ($3 trillion in daily volume) and spreads in the major currency pairs are very tight in the spot market. Heck, if you trade through an ECN you can see zero, and sometimes even negative spreads at busy times.
As for correllation between spot and futures prices, they are naturally very, very high - nearly 100%. You wouldn't want to trade futures off the spot tick chart. Even in the longer-term timeframes you'll need to figure out your levels shifting between the two. It's doable, though.