Digital BW, The Print

How do the r200-r340 printers Using the MIS Spongeless Cartridges with
MIS PRO Pigment Inks, stack up too the r800?? I had an r320, but it
didn't last but a year of heavy use. I do birthday shot parties and
portraits.  I want to print my own 8x10 bordered shots. I have been
using the Epson picture mate for my 4x6 shots but I am really
disappointed with the dot grain. (Even when I use a computer and set
it too show fine detail and iso 200 with a d50) I'm looking for
something better. I got the picture mate from the Epson clearance
site. I then noticed they had refurbished r800 for $199. Is this a
good work horse printer for heavy use?  And the most importantly, can
it give me shots without dot grain?