Super Micro Computer's stock is a great buy after a harsh sell-off.Formerly one of the best-performing stocks in the S&P 500 index this year, Super Micro Computer (SMCI 4.89%) has been on a wild ride. The stock entered the year around $280, then reached highs of nearly$1,200 in March. After a poor reaction to its fourth-quarter earnings report, the stock is now around $500 per share.However, it won't stay that way long because management announced a 10-for-1 stock split effective Oct. 1. That will drop the ...