He approached you, so he should be the first one to make an offer. Because by you making the first move on pricing each domain, he's kinda testing you, whether you are or not a person that knows about the value of domains.
But then again, it also depends on your financial situation, and other factors, etc.....
What I'm saying is, if you're financially secure at the moment, and the reason why you bought those domains is for an investment that you don't mind holding on to untill you get a decent price, then don't under sell yourself.
However again, if you're a full-time domainer that makes money in this business to pay the bills and would be satisfied with at least 2 or 3 times ROI, then you shouldn't be greedy and hold your breath.
Recently a person inquired about a domain I own.
He asked me how much I wanted, I asked him to make an offer, he offered $200, I said $1500, then he said $300 is the last offer, I said $1300 last offer, he bought it!
So lesson is, you don't know the people you're dealing with!
Hope this helps & good luck.
P.S. I bet one of six domains he inquired was Golf.ae...Great reg btw