Let me toss in an additional something to think about re sizing the printer. Whatever models you narrow down to, take a good look at the replacement cost of a full set of ink carts. It can be fairly staggering for the really large printers. I do a lot of file preparation and printing for myself and other photographers and I only keep "in house" a 17" carriage printer. This easily handles 95% of my needs. For really large prints/canvases it is much more cost effective to do file prep and soft proofing in my digital darkroom, but have the print made by someone else. I would love to own a 24" or even larger printer, but it just doesn't pencil out based on the actual need for that size print in terms of total volume.
Anyway, price the ink! In the long run and with any volume of printing at all, the ink will be at least as large a consideration in the overall cost of operation as the printer itself.
And let me add something that has been inferred but not stated fully... all of the printers mentioned so far, and even adding in the 13" carriage printers using the same inksets, are capable of producing gallery level works of art with beautiful detail and color and excellent longevity (assuming the paper used is up to it) when handled properly.
You're in the right place for good advice... Mark, and others here like Jeff Schewe, are truly experts and are very gracious in sharing their knowledge. I've been "taught" by everyone here and it has been a huge help in achieving really fine results.
Best wishes in your analysis.
Rand