I would roll with what you have (although I would get sights and a trigger because I always get sights and a trigger) until your equipment is holding you back which is probably a year or two of serious competition. Buying a 2011 is not going to radically improve your scores until you gain some real experience and even then it won't radically improve your scores!

I agree with jtischauer that long slide Glocks are a good 3 gun pistol, just not that they are better than the SP01. And a customized Tac Sport (not stock) gives the 2011 a real run for its money!

And finally I would not always leave the 1911 at home, it can be fun to shoot 1911s on stages designed for 20 round 9s!