I have some "mission oak" stain from Rockler that I've used on oak. I
didn't seal with anything first, and I didn't have problems with little
white streaks. I tried both shellac and "Nordic Oil Finish" over the
stain, and both worked fine. The gel stain is better than liquids if
you want to keep the color consistent, and not too much darker in the
pores.
Good luck,
Andy