I suppose the price is reasonable for loader and mower included.
When you test it out though, I think you should be trying out a box blade attached rather than just the mower. Make that tractor do some of the harder work that you may end up doing.
Mowing in heavy brush can tell you some things, but doing some ground engaging work will be more definitive as to whether this is the tractor you need.
It takes a little practice to use a boxblade just right, and trying to dig in with rippers too aggressively can bring an HST to a quick stop, so understand that sometimes you need to play with the depth some. I feel this will be a better test than just mowing.
I do an awful lot with my CK20, but if I were buying today, I think I'd go with the CK25 or CK30 with all their extras for not too much more money. Larger frame, more power, easier hookups with telescoping hitch arms and stabilizers.
As for price, a breakdown of the prices for each piece would give me more room to speculate. Price increases have come along since I bought mine in Jan. 04 and I got the tractor and loader for 12,500. Boxblade and backhoe brought it up to $16,681.
I hope this is informative and helpful to some extent.
John