Which online brokerage offers good price and web stability for E-mini futures trading?

Just pick one, none of them are not going to do this....and they are all pretty much the same.Go with a friends recommendation if nothing else

i use transact with genisis trade navigator software i have not had any problems yet

You are really looking at the crumbs instead of the bread. Spend more time on treating your trading as a business and save the tax on your trading profits. That will save you heaps more money and contribute to faster compounding of your capital. If you trade as a proprietary trader you do not have to pay tax if structured through a group like http://markettraders.cc