Personally... I'd buy outright, then buy the extended warranty. Latex is something like 2-3K A year... Epson I was just quoted $2000 a year for the R500, $2500 for the R500 with cheap $500 heads replacements. Can purchase up to 5 years on the Epson... so I usually bake in the extended.
$20K for the printer, 12.5K For the warranty - so for $32.5K You can have a top of the line printer that just came out, all parts / repairs expedited for 6 years... Thats roughly $5500 a year for a printer - Lease payments are probably just as high. Sell it for 10-15K after the 5 years, and buy the "Newest" model...and repeat. When you lease you still have to worry about maintenance / repairs.... This way you don't have to really, Grimco has always flown the part we need out next day and fixed it next day for us.... I think we were down for a week once because a part was backordered.... other than that, its been great.