I have a 1, 3, and rMini. The screen on the 1 looks a little ancient compared to the new ones, but I keep it near the bed for reading at night. The 3 and the rMini both look nice. My daily driver, so to speak, is the rMini for sure.
The rMini because it's the one I bought and it's the perfect size for me. Anything bigger than that just won't do - if I need a bigger screen, I'll just go on my MacBook Pro, but for something on the go or simply to read a book before bed, the rMini is the right iPad for me