R2000/Hi-Glossy2 is good for glossy paper and color, but not for matt or B&W.
R3000/K3 is more flexible, good for matt and B&W too.
But if I can live with only color and glossy, what's the disadvantage with R3000/K3?
Concerns on R3000/K3: I know I'd waste the Matt-black ink, as it will be outdated in 6 months (life once opened), but what if I don't put it on until I really want to use it?
Concerns on R2000/Hi-Glossy2: It seems R2000 is the only printer still using H-Glossy2, Would Epson discontinue this line soon?