Pretty much all current printers should get better resolution than that.
In my experience while recently shopping for a new printer, Epson has
reasonable ink costs, but they have an integrated printhead which is not
user-serviceable and replacement cost is far too high. Clogging seems to
be an issue, but results vary.
Canon has reasonable costs, but they have a replaceable printhead that
costs a fair amount to purchase. Reliability seems to be an issue, but
results vary.
HP has reasonable costs, and the printheads are integrated into the
cartridges so reliability is not usually an issue.
Lexmark seems to be the most expensive for ink costs. They have
printheads in the cartridges, so reliability is not usually an issue.
Some people believe that separate ink cartridges are a benefit. In my
experience, the typical consumption level of inks is reasonably equal,
so either format is acceptable.
I suggest you stick with Canon, Epson, or HP. Lexmark is not an option
due to high ink costs.
When shopping around, I eliminated Lexmark from the list rather quickly.
I also removed Epson after considering reliability of the integrated
printhead. Canon performs well, but having to replace the printhead at
high cost pushed it off the list.
I settled on an HP printer. It's a mid-priced unit with excellent
output, high speed, reasonable ink costs, and high reliability. It's one
of the best and highest rated performers at this current point in time.
Side by side comparisons of text, graphics, and photos, reveal that it's
slightly better than my Canon was using just four colours. Using the
photo cartridge it's even nicer.
You do have to buy the colours separately and that is what makes the ink costs
much cheaper because you don't have to replace a whole multi-colour cartridge
when one colour runs out.
I don't know about "much cheaper".
My now-defunct Canon i850 consumed all three of the colour inks (CMY) at
pretty much the same rate. The levels were so close that it made any
potential savings not worth considering.
I use 5-10 times more photo magenta and photo-cyan than the other colours in my
printer. It would cost me a small fortune to replace all colours at once just
because the PM or PC ran out if they were all in one cartridge.
While it's generally true that six colour printers use photo colours
faster than the regular colours, I know of no printer that uses
completely integrated colour cartridges like that. The photo and colour
cartridges are separate.
For example, my HP printer uses a tri-colour cartridge with C/M/Y, and a
photo cartridge with PM/PC/PB.