Cab and bus fair from hongkong airport to guangzhou

I'd like to tell you that it is hard to get a taxi for this trip. If you are lucky enough to have one, the charge would be no less than 1,000RMB I guess. It is not necessary, because many direct buses are scheduled to Guangzhou every fay from 07:00 to 22:15. It takes around 4h and costs 250HKD per person. I remember the payment with HKD and RMB are both accepted.