I use
Gossamer Links from Gossamer Threads for mine, but it is not really user friendly for imports. I do like the ease of customization though. It is rather pricey though (about $450).
There is a promising new link list script
LinkX from JMBsoft. I just bought a copy and am going to play with it some. It's only $60 and does have an importer script, so that make it a plus! Customization is a little harder, but after you learn how JMBsoft does thing, it makes it a little easier.