Yeah I tribox off a dual-core atm too, similar specs but with a lower vidcard, all windowed & maximized at 1280x1024 full graphics(but no useless options like AA/etc enabled, performance > eye candy yo); adding those 2 more will most likely become noticeable though, and yeah since you do the music stuff I'd go for a quadcore, never hurts to have the extra power when you need it if you can afford it lol