I currently run 2 Roland Xr640's obviously 
eco solvent but I am really looking to get rid of the out gassing. We also do a lot of fabricated 
signs so printing is not the only thing we do but it is the majority.
We do vehicle signage / wraps, pos, banner and some wall graphic and 
windows both one way and solid and event / Function
Also looking for an upgrade in speed.
We don't have much need for white but am thinking to add it. 
I didnt think Mimaki was good for wraps. So i was leaning towards the HP but on the demo they showed me that they do a conformable and stretchable ink, that 3m warrants for up to 7 years on there vinyl.
That put the Mimaki back on my mind.
Long term i would probably end up with both options in the shop but really not sure what to start with.
Also the mimaki did impress me with its ease of use and speed.