I'm surprised that I didn't reply here before
For 4R proof printing: Epson PGPP & PSPP. They are reasonably priced, about S$0.21-0.23 per piece.
For A4, Matt - Epson Archival or Enhanced Matt or Ilford Smooth HWM, Luster - Ilford Smooth Pearl, Glossy - Ilford Smooth Gloss, art paper - trying out Hahnemuhle Albrech Durer and White Etching
For A3/A3+, Ilford paper and possibly Hahnemuhle art paper...

For 4R proof printing: Epson PGPP & PSPP. They are reasonably priced, about S$0.21-0.23 per piece.
For A4, Matt - Epson Archival or Enhanced Matt or Ilford Smooth HWM, Luster - Ilford Smooth Pearl, Glossy - Ilford Smooth Gloss, art paper - trying out Hahnemuhle Albrech Durer and White Etching
For A3/A3+, Ilford paper and possibly Hahnemuhle art paper...