As far as I know Xolox does not limit your horison based on the amount of stuff you are sharing. However I reccoment sharing all the files you can regardless of your connection speed. As half of your bandwidth is reserved for uploads (no more than that), you mind as well help others by sharing. No one likes a freeloader.

Sharaza will also save you search results, however it is a more advanced program that I would only recommend for users who have an accurate understanding of the Guntella network and a sense of honor.