You don't say if the CK30 is HST or shuttle shift.
The prices for both models are probably average if the CK is HST. I would think you could get the shuttle shift for a little less.
Between the two, if going shuttle shift, I'd go with the CK30 because the shuttle is synchronized, the 3054 is mechanical (must stop first before shifting F/R), and because it has the curved hood which, to me, is preferable for better visuals. I prefer the curved arm loaders as well. The CK30 has more hydraulic flow by 2.7 gal/min.
They're both excellent tractors, but I'd try to get that CK for a little less if it's shuttle. John