It's a tricky area at size with the conflicting requirements of quality/cost/practicality - that and the market for high end prints is pretty much non-existent in my area of the UK :-( Just as well that print is not a meant to be a major contributor to our bottom line ;-)
Most of my larger works end up in commercial environments, so the Innova canvas is a popular choice.
Although I almost feel it would get me drummed out of the forum, I like using a 300gsm lustre paper laminated onto foam board with a matte finish laminate on top. This can then be dropped right into a frame made at the size needed. It's a great way of getting some of my bigger 3 metre pano prints out there at prices that don't make office managers faint ;-)