I've been going back and forth between eco solvent and latex since I left ISA a few weeks ago and just yesterday I purchased the Epson S40600.
I think if the bulk of your work is not laminated, go for the HP - but also know you will need an electrician if you don't already have 220v in your shop.
I know of a shop that uses the spray can Frog Juice on eco solvent prints for real estate signs. The word is, it's a great quick way to provide scratch resistance without having to compromise color with the latex. Of course, the color aspect is up for debate in my opinion and after seeing the eco solvent Mimaki, Roland, Mutoh and Epson, and then the HP Latex, I think the Epson prints are the most brilliant in color and detail. This is just my opinion.
I wanted the HP Latex to avoid laminating but realistically latex prints should be laminated too. What I also like about the HP is that it's more eco friendly and there's no smell to the ink, but then I learned that you can smell the vinyl heating up in the HP which isn't something you think about until you experience it.
I chose the Epson for print quality and the 2 year warranty promotion, and because it's same day lamination. Once my printer arrives I'm happy to post pictures of my setup.
Lastly, I also have a Gerber Edge 2, which is a thermal printer. I've had it for years and it's scratch resistant so for certain jobs that I need done same day - I use my Edge. The only major drawback is that it only prints 11.8"h. So between the Epson S40600 and the Edge I feel like all bases are covered for now and I'll wait until they produce a printer that doesn't require lamination at all.
Good luck and let us know which machine you end up with!