I also agree with Fatcat, Vander, etc. Something I have said about latex before and I'll say it again.... while I agree that an ink technology like latex or something with no VOC's is likely the future solvent (full/eco/lite) are very very far from dead. There is a very good reason pretty much all machine manufacturers are still developing and introducing brand new models of solvent printers and that is because they are very well proven workhorses. Does a DX5 or DX7 head cost a couple of grand, yes, but it also lasts several years if taken care of. Also ink costs - I have not researched OEM ink costs in a long time but I know if you run aftermarket inks your ink costs can be very low. Ours is right at .11 per milliliter using Triangle. I'd suggest, especially as a newer shop or on a new machine (or unless you are truly printing hours a day every day) to not mess with aftermarket ink though.
On subject and in my opinion my suggestion for a printer would be related to a couple of things. One is what you are comfortable with. That removes the learning curve of figuring out a totally new setup. You already have an Epson so getting another will dramatically minimize any new learning or interruption, will likely allow you to stock one type of ink that can be used in both machines, one set of color profiles that will be fairly consistent across both machines, one common interface, etc. That's one aspect to consider. Another is if you are happy with the Epson. Of course if the machine is terrible then yes you might want to consider something else. Another is support (unless you are highly technical and already do all of your own support in house) for any technical issues and hardware problems. If the closest dealer for your machine is 500 miles away downtime in the event of a problem can be long and expensive. Also somewhat related is supplies. If ink is not readily available (preferably from more than one source in case one happens to be out of some color) than that might also be a deciding factor. There are other considerations as well like physical size and power requirements. Of course reading real world reviews to see what others say about the ease of use and durability of the machines, their media handling, how good does the takeup work, etc., etc.