I am kind of in the same spot you are. I have thought of getting rid of Little Bunny because she has gotten so mean towards Chase and I. Chase is my heart bunny and he runs up to Little Bunny's cage and Little Bunny grunts and tries to bite him. They were bonded for over 3 years. It breaks my heart and Chase's. I will tell you some things I have done over the last 4-6 weeks that helped me.
I also thought I couldn't have 2 cages. I had to move my end tables. I can't get in to my one bathroom now. I thought it would be awful. The only reason I built the NIC cage was because once Chase recovered from surgery she wanted more room. So I made the 2nd cage until I decide what I was going to do with Little Bunny. Now about a month later it doesn't bother me as much as it did in the beginning not having as much room and having to move things. I resented her that my nice new condo looked like crap with a nic cage taking up half of it. Now I am like whatever if someone doesn't like it don't come over.
I also hated the idea of 2 spearate run times for the bunnies. I mean they were both use to being out 4 hours at least a day. Now each bunny would only get 2 hours. A month later neither of them seem to mind. It is getting easier and we all have gotten in a routine. At first it really stressed me out. But I have figured things out and though this isn't ideal, it works.
The Little Bunny's aggression towards me is pretty much gone. She has stopped grunting at me when I go in her NIC cage. She still hates Chase though. I resented the Little Bunny alot. How could she be mean to Chase when Chase needs her the most right now while she was sick. My resentment towards her has faded also. When she was mean to me I got to the point I was like fine, I will just leave you alone. I still gave her time out and her necessities but I didn't try to pet her or get close to her. I think she needed that space. I also think she was mad because I gave Chase their room and the Little Bunny got the new NIC cage. So maybe the aggression as gone down as she got use to the new cage.
They also went to the bathroom by each others cages. So when I let one out I would put some stuff on the floor in front of the others cage so they couldn't go in front of it and that really helped. I also got one of those long gates that you can make into a cirlce or leave straight and I can put that up like a foot from their cages so the other bunny can't get bit through the bars or get close enough to want to go to the bathroom. This is what I use
http://www.petsmart.com/product/index.jsp?productId=2751767again there is a clip that comes out so it doesn't have to be in a circle.
My next step is to take both rabbits somewhere out of my house to bond. I haven't figured out where that will be but someplace where both of them are scared and will look towards each other for comfort.
I am not trying to pressure you into keeping her. You have to decide what is best for you. I would never judge you as I was going to do the same thing. I do sometimes think about. I just wanted to share with you that a month or so ago I thought there was no way I could deal with this, absolutly no way. For a lot of reasons like you space, the bunny is being mean to me and my heart bunny, my house looks like crap and so many more reasons. I really hope you don't feel like I am pressuring you. I just read your thread and it is the same thing I was going through, though not as much anymore. If you ever need to vent or you have any questions for me please ask. I wish all of you the best of luck. I know how hard this decision is.
ETA: JadeIcing where did you get those solid panels? I may need to get some. Would make it so much easier then moving another gate infront of the whole NIC cage everytime I let Chase out.
