I was pricing these in July. To the best of my memory, the TG1860 Diesel, 54" was roughly $6800. -$6900.
The G2160 60" was $7500.
I remember that the price jump from TG-G was definitly worth $500. to get the larger engine, larger deck, fuel-temp guages, hydro lift etc. All of that was SURELY worth $500.00.
There was roughly a 2K jump to the BX2200 60". If you think about it, that 2K is worth the jump to get a real tractor. I comprimised by getting a ZD since I didn't need a tractor.