According to the review it states that an Athlon XP 2400 + is the fasted CPU that it can use fully due to the BIOS limitations.
You may as well save the difference in cost and use that one as opposed to the 2700 unless you think that a BIOS update would be along soon to enable the faster CPU.
I wouldnt think that you would perceive much difference between a 2400 and a 2700 in any case.
Dont forget that AMD CPUs do not run at the number of mhz that the model no is,for example I have an XP 2100 + which runs at 1733mhz and the XP 2400 + ,according to that review,is around 2075 mhz or probably a little less
1) This board is not for the serious overclocker, as it can only attain 12.5 x 166mhz (2075mhz), and the RAM cannot work over 166mhz, which fails to utilise the new 333mhz RAM.
3) Theorectically, unless the BIOS changes, the MB will only hold up to ATHLON XP 2400+, as anything above that cannot be fully utilised by the system. However the product brief does state that anything up to Athlon 2700+ is acceptable.