I bought a sender from Centroid Products. I can't say how well it works... my car isn't running yet. From what I was reading about the stock sender, I was sure that I would've been disappointed. This sender is a tube type with no moving parts. I bought the 6" version and it sits about 5/8" off the bottom of the tank. I think I paid $52 which included the shipping. Here's the website...
Mike
http://www.centroidproducts.com/