Digital BW, The Print

Hello people.  I'm in a quandry. I currently use an Epson 2100/2200 for both BW and colour 
printing (having retired my ancient 1160 with CIS) switching out the ink sets between Epson  
and Cone's BW inkset with QTR. But I'd like 
to dedicate one printer for BW and have another for colour work, since I do both. I've been 
thinking about buying an Epson R1800 for colour, considering also it's (occasionally useful) 
gloss coating to lesson bronzing on glossy papers.. But:

a) which would be actually better for colour printing - the 2100/2200 or the R1800? And 
which 
would be better for BW?

b) or should I dedicate the 2100/2200 to Cone inks and QTR and purchase the upgrade - a 
2400 with the newer Ultichrome 3 inks - for colour printing? Would the newer printer be 
considerably better for colour than the 2100/2200? Has anyone here used it?

Thanks for any and all suggestions.

cheers,

ncm