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That would sure make upgrades fun!
and 4GB of RAM is plenty anyway for just about any application.
I run 4GB on my rig at home and never use more than 2.5 like ever.
If this is mainly for WOW then multicore is not that important. What you want is the fastest cores. So, a 3.0 core will perform better than a 2.8,...
nothing in the notification bar?
there is an alert/ringtone called Droid which is the sound you are referrring to. Sounds like you have email or some other alert set to using this...