2003 Ford Focus Is it the suspension?

Hi! Here's a real puzzle for you: so far my car's problem has stumped two master mechanics and a transmission man;

I have 2003 Ford Focus ZX5, Manual; a set of sounds come from underneath, all agree the sounds seem to be coming from the passenger side front; the noises more noticeable upon turning right, and gets worse with incline and/or acceleration.

The noise is an occasional bump and a nealy consistance soft grind, almost a gear sound(hence getting the tranny guy involved) but there's no slippage or loss of power.

Here's what's been done so far:
Hub and Bearings replaced on BOTH sides, front passenger and driver. Front Axle NOT replaced.

Two NEW tires on the front>>the two other ones had fine tread, but were in fact lumpy. Cause?Or Effect?

Two mechanics told me they DON'T supect the supension because the noise increases upon acceleration.

What do you think?