LOL!! If I had a TJ Rubicon, I probably would have kept it so no, I would not say that you should get a JK. Having said that, are you planning on sticking with 35's or are you planning to go bigger? Either way, a 4" lift is a BIG lift for a TJ with short arms and I would seriously consider saving up for a long arm kit. If you want to do all the work yourself, I might recommend a Full Traction kit. I ran one on my TJ and was very happy with it. It's a ton of work to install but, it can be done and without any welding required. Click on the link below to see a write-up I did on it back in the day:
http://www.4x4xplor.com/full-traction.html
This will also get your belly up higher.