Dear G,
$15 out of the cost of even a budget rig, say $400:
3.75%....
With the P35, you get a chipset designed by the folks who made the CPU as well. And, they write the drivers with their pals in Redmond (they don't always get along, but, it is in their best WinTel interest to make things work).
With VIA, you get all sorts of weird incompatibilities....please trust me on this.
There is safety in numbers....lots more P35s sold than VIA....
HTH
NXIL