ibl's and other things

hi,
i have just bought a pair of naim ibls and although they sound excellent even though i havent set them up correctly yet i keep wondering what the differences are between the mark ones and the mark two'2.......if anybody knows of a pair to sell can they let me know?
also, how should i upgrade next?
i have:

system 1
cdx,82,250,2x hicap,ibl's,headline,grado rs1.

system 2 (old stuff)
meridian 200,deltec dpa da converter, 102,napsc,140,hicap,epos es 11's and epos es 14's (not yet decided which pair to keep - listening room is quite small)

all help will be greatly appreciated...
cheers,
gus