How high up will your ASUS board go? If it only goes like 110 as some do, 110*12.5 will not get you there, and I doubt there is a higher multiplier.
To me, ABIT boards are nicer than ASUS (asuming it is a working abit board). But if you really like your ASUS, try to get a 112 or so FSB, and you are good. The preformance diff between 100 and 133 is rather large though.