I am a big fan of Isacord embroidery thread. It is a 40wt thread, 100% poly, lovely colors and beautiful shiney finish and no lint! I like bottom line in the bobbin. Also virtually lint free.
I recently purchased Glide thread (recommended by Karen McTavish) and the same company's magna-glide prewound bobbins but I haven't tried them yet. Also a 100% poly thread. I believe Glide is a 40wt but not positive, it may be 50wt.
Superior has wonderful threads, they are the maker of bottom line. I have used their Rainbows thread and it was very nice but it doesn't like a whole lot of tension or it breaks alot. Took me a while to figure that one out. I do have King Tut but have yet to use any of it yet.
YLI also makes wonderful threads.
By far the thread I have used the most thus far is the Isacord.