What you are asking for is the Holy Grail of Trading. The Holy Grail of Forex Trading should also establish world peace, cure cancer and grant wishes.
Most signal systems that work are closely guarded secrets. As a professional community based developer for MT4 trading for over 2 years, I had seen and programmed a large number of Expert Advisors.
A few quick tips.
#1 Never trust backtests. Only trust live tests, after 2-3 months of run time, and only what you can afford to lose.
#2 A moderate gain EA with low risk will have money thrown at it, and people will gladly pay a percentage of monthly profits for the EA.
#3 Everyone agrees there are at least 2 market types: ranging and trending. In Forex (and in 2007 stocks) you will also see "News" where the prices change rapidly. "Undecided" is also a common market type. EA are likely to perform well in a single market type, and lose in the others.
#4 There are a large number of community developed open source EA. Join a community and learn the ropes before throwing away money.
#5 My bid price is real. That $200k bid would be a "cheap" EA that does what you ask.
I made trending, counter trending, news based, range based, etc all as separate EA. It is reasonable to ask a freelancer to program a trading strategy for automated testing as long as it is based on hard rules. Your request is unreasonable at the price listed.
The EA that I would deliver for $200k would be EURGBP ranging, trades frequently and is not based on signals.