This one. It's by far the best one available to date. --- My ignore list is exclusive to trolls only. I should warn you though, it's crowded and the trolls imprisoned within are mean, anti-social and well... ignored.
The original will always be one of my favorite games ever, let alone my favorite SC.
I had a few chances to play against some of the best SC1 players in the US...it was so much fun to see the different styles each super-competitive player brought to the table. SC2 was fun for a while too but I just couldn't get into it like SC1.