My girlfriend has the Targus stylus (http://www.amazon.com/Targus-Stylus-...pr_product_top) for her ipad and hasn't complained about it since I gave it to her in April. Its only 10 bucks, so even if it lasts 6 months it doesn't feel like a waste. She mostly uses it for Draw Something but occasionally uses it for general clicking and browsing.
It seems good the job, so that's the one I plan to get. I Can't comment on how precise it is for detailed paintings though