if you had a family fund and have just established a line of credit from a prime broker - your going to ditch retail - and wanted to run you own server colocated and have settings where you are not marking up the spread.
And it is a private server - so your not doing admin for other peoples trades.
Possibly MT4Server and a liquidity bridge.
And if you do enough volume to get a good liquidity provider and a good liquidity plan (I assume you buy into these things) ... i.e. dukascopy as primary and Integral and secondary. Or FXALL and Bloomberg etc etc .
And you aim to get tight spreads ....... what is a good point to begin / look .
The reason i ask is - when i looked at bigger players a while back - like Hotspot - I was surprised to find that bigger players - perhaps even Deutches Bank - dont necessarily mean tighter spreads. It will mean more liquidity and faster orders but not necessarily tighter spreads.