try to legatto your way through a scale. so 1 pick per string, then hammer on through the rest of the notes on that string, and do the same thing on the next string etc.; return with 1 pick strick an used pull offs.
a lot of speed comes with that technique. ie, not picking every single note etc.
learn Hot For Teacher intro.
even theh rythym has a cool legatto to it.
Flying in a Blue Dream by Satriani has some good challenges, but not impossible.
Shot in the Dark by Ozzy is another cool one/fun solo. challenging.
Bark at the Moon too.