Best Fixed Odds dealer for FX? (Oanda & Refco too)

Oanda will be introducing "Box Options" which are basically Fixed Odds betting thingy. Too bad we don't know when it'll be out.

Refco have their Options platform. http://www.refcospot.com/
Anyone using it to place bets? Good? The "minimum bet sizes" are kind of big, like requiring bets of US$10-100 per options.

What other good Fixed Odds dealers are there? Those that are governed by a watchdog organization like a FSA or has good financial standings/history. Refco and Oanda seems to be the least likely to "go under" any time soon...

www.binexx.com

reference: www.cityindex.co.uk

"Binexx.com Ltd is a wholly owned subsidiary of City Index (Holdings) Ltd. City Index pioneered the modern development of spread betting, is the creator of sports spread betting and is one of the market leaders in financial spread betting. City Index is in turn part of the Intercapital Private Group of companies, which has a significant shareholding in ICAP plc - the world's leading derivatives broker, listed on the London Stock Exchange and a member of the prestigious London FTSE 250 index."

Who else than Betonmarket offer the following fixed odds trading;
Touch, No touch, One Touch, Barrier range,... for indices (S&P, FTSE,...) .
Refco offer only these type of bet (SPOT) for currencies only unfurtunately

Fine.

But let some of you share your real success experience with these brokers.