I've looked at the specs for the Epson 4800 and 7800, but I can't find information on whether or not the 7800 has a paper tray for cut paper. If if doesn't have a tray, how do you feed cut paper--one at a time? Although I would like to have the ability to print 24 inches wide, if it means that it's a hassle to print smaller prints (8 x 10 or so), I might forego the 7800 and get a 4800 for the conveneince of being able to print smaller prints easily.
if up front expenditure isn't a problem I would definately choose the 7800.
Yes you'll have to hand feed sheets......but the ability to go big....is great...good luck!