I want to use Firetip as my platform.

There seems to be more brokers offering it free now but is the cheapest commissions the way to go?
As of now I found 3 brokers with good round trip ES, YM, NQ contract prices.
The question is which to go with?
Does it matter now days if a brokerage is fairly new?

Champion Futures is offering $3.96 round trip total
Back Bay Futures is offering $3.89 round trip total
Cannon Trading is offering $4.20 round trip total

I know a broker can probably not lock me into a price for life but I do not want to be seeing an increase every 6 months either.
I also want quick execution on my limit orders.

Thank you

Retrobeast 

I want to use Firetip as my platform. ... Back Bay Futures is offering $3.89 round trip total ...

Back Bay Futures does not have FireTip.

traderwerks 

Back Bay Futures does not have FireTip.

Thanks to @Retrobeast for pointing out that IronBeam does offer Firetip through Ironbeam.

I stand corrected. I thought they were a Ninja broker. I thought they only had the Ironbeam/Ninja connection.

I know FireTip now has a mobile function