I don't know your neighborhood, and I wouldn't dare second guess your agent. However, there are some things to point out:
1) If you're not willing to pay it, then it39;s not worth it to you. If it is a steal, and you have a different value of the market, then you'll become educated and change your mind... or you'll drop out of the house hunt until your opinion of value and the market are in sinc. Never, never, pay more than you think you should, because ultimately it is your decision and you need to deal with the long term pros and cons of that decision.
2) I always wonder why, if one trusts the agent they've chosen, why they would come here and ask for a second opinion? You must have an agent that is trustworthy in your eyes, and then you must actually trust them.
Best of luck.