My cousin has an ipod touch, does he use it for word processing? yea, but more memory is better, 512 is the average(even in laptops, they share the system memory pool)and 128 mb does not cut it, unless you are using Photoshop or playing the sims.
What businessman uses a mac? If you were a graphic designer( a target demographic of the mac) then you would want a good graphics card with alot of memory.