I think theres risk in any broker you use, the guidelines set my the govern officials is to have over 5M in capital. This I consider to be a borderline amount. I use big brokers, although not guarentee, but I feel better 100M or more- this forum has a thread on Rank Your Broker- dishing out there financial statements. Make sure they ARE REGISTER with someon, although that doesnt mean anything either, but it makes me feel better, and that is what this is al about - making sure you feel good about all this .
I use Oanda. A powerhouse backing of luke warm cash! Doesnt mean the lower CAP brokers are bad, but IM all about highrollers and protection.
If your book is borderline 5 MIL, becareful - research! They will increase this amount soon too, so dont think 5 M is safe.