I got a free set of inks and free installation when I purchased my latex 110 for my place. Canadian rules may be different though.
For our 560 we paid for ink and installation, But we got a rebate on our old printer.
You may be able to save a couple hundred here or there going with a different company... But it's not worth it. We buy all our equipment from a certain vendor, just because we like their service rep. Another vendor we use for media knew we were getting a new printer and tried to sweeten the deal... Would have saved us around 2k, but we told them no.
For us... The most important thing is service. Would you buy a Lamborghini and then bring it to a Walmart repair center because they're the only ones who can service it?
Buy whatever machine has good support in your area. Latex vs solvent... They both have their pros and cons. But none of them out weight having to wait a week or two for a tech to come fix your machine.
I don't know what reps are good in USA. While grimco seems to be the best in Canada, I've generally heard bad things about them over there. All I know is bigfish is very respected on here and is a Latex guru. He didn't even sell us our machine and he's helped me with media selections and other latex questions. You can't go wrong with him, if you choose the latex route.