I say just keep that, performance should be fine with those timings.
And if you want to go 2GB, get a matched set with the same or better timings, otherwise you will notice some performance decrease. Even if the decrease will only be noticible from benchmark results, and not from everyday use.
And if you want to go 2GB, get a matched set with the same or better timings, otherwise you will notice some performance decrease. Even if the decrease will only be noticible from benchmark results, and not from everyday use.