At this volume you might be hard pressed to beat the costs of offset printing. While having your own color laser is hard to ignore the benefits it shouldn't cost less than your average offset print run.
I'd check into what color printers (not a printer printer but a company that prints) are charging for your 800 color sheets.
I currently have a Konica Minolta Magicolor 2450 (purchased less than 1 yr ago and now it's discontinued). I feel I am wasting my $ buying toner cartridge after toner cartridge and now the OPC drum.....
Rather than dump more $ into a discontinued item, I'm looking to buy new! This printer is excellent - don't get me wrong - I apparently print a hgher volume than I anticipated. My output is max. 800 double sided color newsletters monthly. Looking for suggestions which have excellent quality and decent speed and cartridges which last! Maybe the solid toner units? I don't know! Looking for your help here! Anything is appreciated! Thanks from your Illinois & Wisconsin Realtor!