No response so far from any bros about agents. But bro coolmanks (
http://sammythe.guru/interna...ping-1314.html) mentioned two agents for CP who are active on sammy: ISO 9000 & pc5526. Another bro, Lookingaround2 has also been making offers – presumably he is also an agent. I have seen many non-Chinese speaking bros visiting CP - maybe these English-speaking and presumably Singaporean/Malaysian agents will be good to guide them, and preferable to many Taiwanese agents who do not speak very good English, if any.
I have not met any of the agents mentioned above, or used them, and I would suggest you ask each of them to quote you a price for what you want to compare. But then, at the end of the day, it is the service and whether you feel you get “value-for-money” that matters. IMHO, with increasing incidents of hassling and kidnapping of tourists in CP, any actions/advices by such agents to enhance your safety will be worth your money.