Sounds like you've pretty much determined that one of these machines will work for you. /forums/images/graemlins/smile.gif
If it were me, I'd first determine which of the dealers I felt more comfortable with. I've always considered that a primary consideration.
Second, which tractor fits ME the best. I wouldn't want to be sitting on a tractor for a bunch of hours that I didn't feel comfortable sitting on after only 20 minutes. /forums/images/graemlins/crazy.gif
Third, which one has the most bell and whistles that will make using the machine easier. For example, I don't recall if either one of these has the extendable 3 pt. links, but that could be a deciding factor for me. Also, how are the controls laid out? Are they easy to reach and use, or are you having to bend over and reach around things to use a lever or knob?
Another factor that I would certainly consider is the loader. I believe the TC30 takes the 7308 loader, which has straight arms, while the CK30's loader (I forget the #) has the curved arms. The curved arms certainly provide a better view to the front of the tractor.
I think you're very lucky to have two fine machines of such similar quality to consider. Good luck on your decision, and make sure you post some pics of your final choice. /forums/images/graemlins/wink.gif /forums/images/graemlins/grin.gif