What is the best broker for scalping?

scalping is my favorite one. very challenging trading style. yes indeed a low spread is a must, ECN type would be a minimum requirement, brokers should supported by strong solid Liquidity provider as guaranteed the execution process.
for whom still concern about how the brokers spread is, have a look their actual spread compare to other brokers.
http://www.myfxbook.com/forex-broker-spreads
my scalping ea works well with Armada Markets trading enviroment, 0.7 on EU pairs commision included. there's one thing they provide which others missed, a low Stop Level, i'm a scalpers, based on EA, but not by instant entry, but it used stop orders. by this reason a low stop level are a must for me.
 
In scalping you will need a broker with tight spread and fast execution. I trade with more than one broker fxcm and profiforex but when it comes to scalping profiforex is good choice for me because their trading condition is very favorable for scalpers.
 
I use Freshforex ECN account for scalping, it provide quick order execution and no slippage. And spread is tight (from 0 pips), which is also good.