years ago I would agree with you, but as the inks have developed I find it to be less so. Especially on something like a Versacamm, afterall they are an Epson head inside anyway, just a different ink passing through itI have found solvent printers to be very poor printing on canvas, they just don't have the same colour range or vibrance.
Suppliers I use are
http://www.picturemaster.uk/ & http://www.colourbyte.co.uk/
Grafityp are a superb company as already said by Andrew.
