adopting two cats is better, they can keep each other company.
cats do need lots of attention and affection. if you don't have the time, don't do it.

wait until you can. they can not take care of themselves.
mine needs to be brushed, her ears cleaned, her butt cleaned, ect. - every day.
and i play with her every day, so she gets exersize.
vet bills, in my experiance, are usually high & medicines for cats are more expensive than meds for humans.
about insurance - they consider a cat elderly at age 9, and charge a lot more, going up each year. i'm talking about VPI insurance, which doesn't pay for pre-existing illnesses or office visits.
i buy the most expensive food, California Natural. and it only costs $5 a month.