What are you running ?
I could manage 25m/s in J River.
If you do 50 m/s you should be OK.
J River with Event Style is what I prefer too.
However, most friends of mine have moved on to J Play & they seem to prefer that.
I am running it on 200 m/s... and it seems cool with that.
JPlay is good too, but Jriver is simpler to use... at least that's what I feel.
I might just move to amarra + apple (either a macbook pro or a mini) at some point of time, though.
Apple stuff is so much better even for audio!