8x10 is used to be very impressive already when I printed with chemical. I often went 10x10, sometimes, though very rare, to 12x12. Haven't done that for a few years.
Strangely, with digital print, 8.5x11 is never enough. A 11x17 is like the 8x10 in my old days, so I think 13" should be the minimum size to go, and I'm looking up to 17".
The problem is, I'm not sure I'd have enough volume. Epson 17", R3880, has 80mm ink tank, and it should be drained within 6 months.
Anyone knows how much prints (in, say, 13'x19") for a 80mm ink? what about 25mm (EPSON R3000), and 17mm (R2000)?