Digital BW, The Print

I think I'd like to purchase a 2200 for B&W printing because I'm sick
of constantly fighting UT2 clogs in my 2 1280's. I feel like I'm
spending more time performing printer maintenance than printing
photographs. 

So with that in mind I'd like to ask three questions:

1) Since 2200's are made for pigment inks I assume I'm going to spend 
a lot less time unclogging them. Is that correct?

2) If you have to replace the eboni black with the photo black (or any
other cartridge position for that matter), do you have to put in a
FULL cartridge or is this not an issue with the 2200? In otherwords,
can you let a half empty cartridge sit around for 2 or 3 weeks, then
put it back in without any problems?

3) Last, does anyone know, if I initially purchase the prefilled UT7
cartridges from MIS, whether they come in the new refillable type, or
do I have to purchase those separately and fill them myself?

Thanks,
Mike