Nice score, DDR3 triple channel should be around 20k+, at 1600 MHz, this is a good score.
The expert tweakers here can get a little bit more.
Go back through this thread and check what people with similar specs as yours are getting.
Just remember, they have been tweaking their systems for several years, getting another couple of k's will take a lot of reading and time. High quality RAM can be OC'ed easier, as well.
If you really want to give your system a boost, start reading about SSDs. Show us your SSD performance