Tires - vibration

I have a 1998 villager 135K miles on it. Just did a complete brake job, pads, rotors up front, rear new shoes, hardware and drums.

The brakes were in pretty bad shape especailly the rears, the grinding noise and pedal vibration is now gone, however when hard braking going down hills and driving at highway speeds (55-70) it feels like it has a vibration from the rear end.

I'm going to put new tires on it, as they are mismatched now, I hope this will eliminate the vib problem.

Do you guys have a recommendations for tires I am running 205/75/r15, I plan on keeping this van until it dies.

Thanks

Steamplant go to this site it has a discussion about tires going on now.

http://redirectingat.com/?id=252X400&url=http%3A//autos.groups.yahoo.com/group/villagerquest/ (http://redirectingat.com/?id=252X400&url=http%3A//autos.groups.yahoo.com/group/villagerquest/)

Just to update this, the vibration was due to a bad set of brand new brake drums. How frustrating is that? I put the old drums on, vibration went away, Chinese parts.