Also, how do the Rolands compare to the Epsons?
On this forum I think you'll find the Epson in the lead. Seems to have been a lot of issues with Roland. Maybe Roland got them fixed but I have no way of knowing.
Either way do a forum search.
Best bet is to make up a brutal file with Memory colors(personal photos work great for this) Pantones, 50/40/40 gray, 50%K, color bars with tints etc...
Then go to the showroom and get it printed. Don't just go by what your eyes tell you. Do an instrumented test with a densitometer.
You'll need to find someone with a densitometer to get color values but at least you'll have an understanding of the printers capabilities.
We just finished our first semester teaching a class about controlling color. Your eyes can tell you a lot but are not reliable color indicators. That's why we rely on instrumentation to tell us exactly what we are or are not getting it terms of output.
No more subjectivity. You either hit the specified DeltaE or you didn't.