I've used a few papers with my Epson R3000, obviously not the same as what you're using but here's what I've used and how I got on with them.
Fotospeed PF Satin, Gloss and Lustre all worked and the Platinum Baryta also gives good results.
Permajet Oyster and Ultra Pearl both gave good results. However the Ultra Pearl has a very noticeable texture compared to others I'ver used.
Ilford Galerie Prestige Smooth Pearl and Smooth Gloss also give nice prints, but out of all the papers I've used these two have the strongest smell. It's like a mild 'sick' odour, you need to be very close to the print but it's only these two I've really noticed it from.
Hahnemuhle photo rag pearl is very nice, and the reviews for it are really good. However I did a set of test prints of the same image on this, Permajet Oyster, Ultra Pearl, Fotospeed PF Gloss, Lustre and Satin (I don't have A4 size of any of the others I've used). Out of them all I preferred the Hanhemuhle Photo Rag Pearl and Fotospeed PF Lustre, but it was quite close.
Overall though the best paper I've used is Canson Baryta Photographique.