What's your favourite gear ratio?

Having ridden 44x16 on my fixed, I'm planning to get a new crankset so might as well a new cog(s) for my flip-flop hub, what would you suggest for someone that goes to the velodrome 2-3 times a month but uses the same track bike on the streets to train that rides brake-less and has occasional hills(I can power though the hills on my current gearing)

49t ring and 19 or 18 on one side then 15 or 16 on the other.