At one point I had 7 cats in a 2 bedroom apartment. My two old guys Spliff and Fatty who I still have, and a Momma cat Jericho(was a stray I found) and her 4 kittens: Azarel, Jezebel, Concetta, and Zero. It was very expensive, because I insisted on having them all fixed and given their shots. Not to mention paying for food for 7 kitties. (A mix of high quality dry food and wet for their evening snack.) and the litter...I had a box in each bedroom, one in the bathroom and one in the closet. With that many cats it had to be changed 2X a week. Not to mention I was paying for all this on a housekeeper's salary. ($10/hour canadian) I would go without eating/spending money for things I needed just to keep them fed, healthy and clean. They were my top priority over my own well being. And the CLEANING...it never ends! I clean all day at work and come home and clean up after them all evening! It was very challenging, expensive, and required many self sacrifices, but I would do it all over again if I had to. Just to see an emaciated stray and her sick kit's grow up to be healthy, happy and well socialized paid for it all for me in the end! They've all gone on to excellent homes now, just my two boys and a stray (Ravey) which has been around my house lately who has been fixed and vet checked, and will be going to a nice home in the next week.
This is just my story, as for you, I can't give you an answer on what to do, but PLEASE just realize that you may have to give up many things you need for yourself in order to take care of them. Please really think about why you want to do this before you take in more than you can handle and the whole situation blows up in your face! Good luck with the decision you make!