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I don't know that you'll be able to get much more than that with your hardware but...

1.) Try turning on all speedhacks to maximum (the vu cycle stealing set it to 3 and see if it works well without crashing your game)
2.) Set your resolution to native
3.) As a quick check make sure your power profile is set to high performance in windows control panel so that your processor is always at full speed (you'de be surprised how easy it is to forget about this)
4.) Although it might only get you a 1-2fps increase in speed try turning off windwos aero (set your theme to basic if you are running Vista/Windows 7) this might not make any difference for you but it did for me
5.) You could try downloading the latest beta from http://buildbot.orphis.net/pcsx2/
and in the speedhacks section enable the new MTVU hack (this helps if you have more than two cores and even though you don't try it anyway and see if it makes any difference)

That's all i can think of...

Edit gsdx ini file then add allowhacks=1 plus use skipdrawhacks to 1 or 3.

@Qaddafi:
1. done
2. already set it to native
3. checked
4. ignored
5. just realized that I've downloaded r4839 before (but used 0.9.8 which is the latest stable version), I'll download the latest svn later..

@Register:
done

Result: 60fps in battle
Thanks, guys.. You're really helpful.