good question - i wonder if any site has done a review of printer drivers..
I hope you're not thinking about buying an epson printer... I would advise you not to.
I've had an hp930C, and an epson CX3200. I was extremelly happy with the hp, but i moved out from my parent's house, and had to buy another printer.
I am extremelly disapointed with the epson, though.
It has a bunch of problems: when installing it, it instals a stupid amount of unuseful apps, gets 2 (!!) unuseful processes with the startup of the computer, doesn't print any better than the hp, and takes about 3 times more space than the hp equivalent (the cx3200 is a multifunction printer, with scanner included).
But, the biggest problem of all, is that the cartridges last MUCH (like 5 times) less than the hp cartriges, and are exactly as expensive.
Truth is, that i'd never buy an epson again.
But i love my hp