If by '3 sided bleed' you need to print borderless on 3 sides of the paper then you would have to get the 3880. The other 17" 'pro' printers, Epson 4880, Canon iPF5x00, do not print borderless on sheets.
If the 2880 is like my desktop printers, including a 13" Canon i9900, you will not be able to get it to feed that many sheets without having feed issues. My iPF5000 has much less issues feeding. Its nice when you can load up 40 sheets or so, press print and come back in a few hours and have it be finished. Originally I was able to run around 40 sheets with no issues, no I can run around 25 sheets before I have to clean the pick up rollers. I run around 1300 sheets through the iPF5000 each November printing calendars. With the iPF5000 I doubt you would go through two complete sets of inks.
If you need the borderless option you would have to go with the 3880. You would come close to spending the same amount of money overall buying the 3880 and needed ink compared to just the ink for the 2880. But, you would have a new 17" printer after the fact.
Here is a quote from an inkjetgoodies Epson 3800 review
"LIKE GETTING A FREE PRINTER UPGRADE... Although the Epson 3800 is $445 more expensive than the Epson R2400 ($850), the 3800 comes with $450 more ink than the R2400 (and at a lower cost per millimeter) -- so it's almost like getting a free printer upgrade when you're willing to buy the Epson 3800 (17") over the Epson R2400 (13")."
Also from the review of the Epson 3800 from inkjetgoodies.com to get an example of ink costs per ml.
$1.35 / ml with HP B9180 ink cartridges (27 ml carts)
$0.95 / ml with Epson R2400 ink cartridges (15 ml carts)
$0.75 / ml with Epson 3800 ink cartridges (80 ml carts)
$0.65 / ml with Epson 110 ml ink cartridges used in 4800/7800/9800
$0.58 / ml with Canon iPF5000 ink cartridges (130 ml carts)
$0.51 / ml with Epson 220 ml ink cartridges used in 4800/7800/9800
You would spend close to half buying the 4800 carts (220ml) over the R2400 (guessing similar to 2880)
You would probably have less hassles with the 3880/4880 or iPF5100 over the 2880 so even if there was not any saving the time saved with hassles would be well worth it. Example-the i9900 I would have 50 or more sheets that I would have to throw out due to partial print misfeeds. The iPF5000 I might have 5 sheets.
Tony B.