Buying a hitachi zx230-2007

hi, i've cat 320b (serial number-1XS-00560 YEAR 1997) and make troubles every day , with now only having 13000 hrs on the clock. recent years i tried to trade it but not lucked to to trade that also.i've bought it for 54000 usd on 2014/march/15 with 10000 hrs but but anyway we need advice to buy HITACHI ZX230-2007 10500 clocks for 61000 usd which recently imported from Australia that used by Fulton Hogan COMPANY. we need advice on following matters before taking another wrong step as before.
1. is it worth to buy?
2. fuel consumption compared to 320B ?
3. problems and issues of the 2007 zx 230 series after 10000+ hrs?
here the link of original pic of the machine
http://ift.tt/2eDeCln

also need some advise to repair procedure of the boom crack of the 320b ...

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Buying a hitachi zx230-2007