I bought all my timing belt stuff here:
http://www.hyundai-autoparts.com/partslookup1.jsp
They must just stock real common stuff, but they had what I needed and it
was a lot cheeper than the dealer.  I got water pump, hydraulic tensioner,
timing belt, 2 serpentine belts, and break pads and had no problems with
anything.  This was for a 2002 XG350

Dan

I've used Brembo OEMs on a few different vehicles.  Never had
any trouble with them.  Seem to be good quality.  Have purchased
them online from Tirerack and a local Bap/Geon.   Haven't yet had
to replace the rotors on my 2005 Sonata.  

In my own experience, the only time I've had problems with
warped rotors is after lug nuts were overtorqued.  Hard driving
and braking has never done it, at least for me.