Dilemma on moving my older cat from home or adopting my foster baby.?

In a couple weeks, I will be moving in to my pet friendly apartment to start my third year of college. We are only allowed two cats, and my roommate is already bringing hers. My original plan was to bring my 11 year old cat with me. However, I fostered a kitten for several weeks over the summer from the time he was 3 weeks old, and became very attached.

I had doubts about whether the move would be a good idea before this happened (at about 4 years old he became an indoor/outdoor cat because he started to pee inside the house, and in his new home I would have to keep him inside the apartment with another male cat - I wouldn't want to keep him inside my room all the time.

Now that I have become so attached to this kitten, I feel bad...I tried going back home and leaving him behind, but I really really miss him after a week. I still love my older cat, but I got him when I was much younger and didn't do most of the work of raising him myself, my mom did it, so I never bonded with him quite the same as I did with bottle-feeding the kitten. I feel like the kitten is my baby, and while I feel like my older cat deserves more attention (though he does get love at home with my parents, he'd get more if he was more of an only cat with me), I'm not sure it would be fair to uproot him and then either have to leave him alone in the apartment when I went back for breaks, or move him back and forth several times during the school year.

And though I am a college student, I do have the ability to provide excellent care (quality food and pay vet bills) for a cat, so that isn't an issue, I know kittens cost more at first because of all the vet care required for fixing and vaccinating them.

At home there are currently three other cats (female) so my older cat hasn't technically been an only cat, but we don't let him wander free in the house so he doesn't get much interaction with them. I'm just worried that a male cat in such close quarters might cause him to start peeing inside again, or that the move will be too stressful.

Also, if I don't take the kitten instead, he will have to go to a different home because of the limit on cats in our apartment, which makes things even harder. I feel like I'm betraying my older cat, but I love the baby!

I could possibly more to a different apartment next year that allows more cats, but that isn't definite.