High Volume Consumer Printer

Hey guys, I am looking for some help. I have recently been hired on to handle photo ops for an actor management company at conventions.
I handled my first one last weekend and all went pretty good except for the cost of prints was way higher than what I felt it should be.
I am currently using an HP Photosmart D7560 with uses HP 564 inks.

Here are the problems I encountered:
1. Speed was way too slow on best using glossy paper, matte paper was fine.
2. I went through just over $500 in inks on two photoshoots, printing a total of 225 8x10 prints. I went through an amazing amount of photo black carts.

I am looking to upgrade to another printer for these jobs that may be a bit faster and also have higher capacity cartridges to hopefully get more prints per cartridge. i cannot get into the high volume more commercial printers because it needs to be "semi-portable" (fit in a large suitcase or shipped easily) as my shoots are going to take me all over the country. The photo quality needs to be "very good" but not "absolutely amazing'. My main concern however is less ink usage to keep these jobs profitable.

Here are the printers I was looking at:
HP Officejet 7000 Wide Format Printer
HP Officejet Pro 8000 Printer (have read some bad reviews on this one however)

I am willing to consider other brands as well I just really did not know where to start.

Thanks in advance for any help you can give.
CJ

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