Digital BW, The Print

I've been thinking about the Epson 2400 because I understand that it
already has the black inks.   However, the R1800 is reduced to $329 @
CompUSA.  Should I jump on the 1800 or is it better to step up to the
2400?  I guess the big question is, do I have to buy a full black ink
set for the 1800 and not have to buy the set for the 2400?  That would
level the field a bit.

Thanks for your feedback.