You don't say how many miles are on the car but I'd guess wheel bearings
too. Since it appears to depend on car speed alone not engine RPM, that
would seem to preclude something like the fuel pump. If it sounds the same
when the brakes are lightly applied, that suggests the brakes are not
involved. Still, that could be easily checked by any competent mechanic.
Does it sound any different when cornering as opposed to going in a straight
line? I doubt too that a CV joint is involved (that problem is usually more
evident on low speed turns) but the CV boot integrity should also be