If you go for a HP, Cannon or a Epson, then I'd recommend one of these continous ink systems.
I've been running one in my Epson R265 for over a year now and never had to refill the ink. Intial cost is about 2 sets of original ink cartridges, but with at least 5x the amount of ink.
With children in the house normal cartridges were too expensive to run & I had no end of problems with compatibles.
http://www.continuousink.com/default.asp