Very good info guys.  I don't have a driveshaft currently and would ideally prefer to buy a 1 piece.  Jsut had a chance to buy a stock shaft for really cheap.  The guy says they're the same and seemed to me that they would be different.  Just wanted to check.  
As I have a R154 and will be runnin that with a twin turbo 1uzfe, no sense in risking anything and sacrificing response.  Just do the 1 piece and go.  
Thanks again guys!!!