Unless you notice your system resources(amount of ram) are in the toilet(<%50) after only a little time of having your system up and running, which would indicate a memory leak somewhere, I wouldn't bother with RAM manager programs. That's just my opinion though. I think they end up taking more resources than they free up, and with 256, I don't think you should have to worry about freeing up ram from time to time. I have the same, and don't find much difference at all running my computer three days after booting up or 3 minutes after booting up.
I used to be concerned as well with freeing up ram, and tried a ton of those programs, but the intermittent freezing while the program "does it's thing" was a little annoying during games, sometimes.

If you really want to try one though, I kinda liked the one
this guy makes.