We do. A Point guard, or just a primary ballhandler that plays on the perimeter, that's what the Spurs most obviously need. That's why all this talk about a defensive minded pioint is crazy.
The Spurs will have 3 great defensive prospects next year: Wemby, Sochan and Vassell. Add to that a 3 and D guy through free agency (which are a dime a dozen now) and you don't need any more defense.
What the Spurs really need is a 3 level dynamic, point of attack, scorer (which, unlike the 3 and D guy, is way harder to find). Get busy on finding that guy first and then you can start worrying about finding those 3 and D glue guys to round up a championship contender.
You don't waste lottery picks aiming at role players, you shoot for the stars and if the player ends up being a high end role player, then that's fine too. But you just can't think of moving up to the lottery picks thinking of getting a "defensive minded PG that keeps defense honest". That's just not how drafting in the lottery works.