OK...you have all been great with your input. Here's where I stand:
I still don't know if I should get an HP or a Canon. I've narrowed it
down to the Canon PIXMA mp830 or an HP all-in-one, of which there are
a number of models to choose from through Apple. I think we're
leaning towards the 5140 or the 6180.
This, however, is where I'm stuck. I mean....I'm at the point of just
drawing a name out of hat! It seems as if every set of reviews out
there says the same thing about each of 'em.... on Amazon, for every 4
people saying a printer is great you have 1 saying it's the worst
thing they've ever used! I haven't seen anything that really
distinguishes one from the other. I am just kind of lost. So....if
any of you helpful computer people out there have a final opinion on
which one of these things to get I would appreciate the input. What
matters to us is that 1) both computers (Mac and PC) can use it 2) it
scans, faxes and prints to the best quality an all-in-one printer can
muster 3) it's reliable and 4) hovers no higher than the $300 range.
Whether you get HP or Canon I don't think you can make a bad decision.
My advice is based on my own personal experience. Many of the reviews
you read on the web are not that well done and the reviewers have never
touched the machine themselves or used it long enough to have an
accurate opinion. You will get some of the best recommendations in this
newsgroup from people who have lived with a specific printer for years,
like me.
Also, I advise that you read the specs for each printer carefully. A
quick review of the HP printers you referenced was vague as to duplex
printing as a standard option and there was no mention regarding duplex
copying. The Canon also has two full size paper trays verses the HPs
one full size and the second a 4"x6" tray. Maybe these options aren't
that important to you but I find the duplex printing very useful and
wish my MP780 would duplex copy. Also, check on the price for
replacement cartridges and how many pages per cartridge set you should
expect.