On main around 110 000 kills ( i would have more but i was pvping with alts and my friends chars + i didnt had internet for about 4 months)
on alts around 60 k + i would count around 40 to 50 k on my friends characters i was playing when he got bored or didnt have time
So if i only focused on my main i would have 200 000 kills and if i didnt had problems with connection i would break 250 000 hks easy by time cataclysm goes live