If you said which Gigabyte mobo you had it might be helpful. Since the 2500+ is 11 X 166, your multi must be higher (youv'e got a 2700+). So you shouldn't need the FSB all the way to 200 to be at 3200+ speeds. Or, if you do get to FSB 200, you'll be running faster than a 3200+.
OK, I found this
Link to AMD CPU Identifyer Says your running at 2167mhz. So that means a multi of 13 if FSB is 166
If you reached FSB @ 200 you'd be running at 2600mhz. That's pretty high. You need a FSB of 170 to reach 2200mhz (the 3200+ speeds).
EDIT: Sorry, got carried away with the math thingy. To answer your question: Assuming your chip is fairly new with a locked multi, your only way to OC is by raising the FSB. Raise FSB in small increments (my first adjustment is 5, then I go to 3) till it's not stable (use Prime 95 to test). Then up the vcore (voltage to cpu) by a notch till it is and continue on.
Does your mobo have a PCI & AGP lock?