You aren't being selfish to expect some sort of idea. Or, if you are, then you are being exactly as selfish as every sensible woman who's thinking of getting married ought to be.
"He says he feels like I am a spoilt cow in wanting things when I want them, and that i have to get my own way with things. "
Bloody hell. DH and I had some isshoooss in the run up to our wedding (long distance relationship that year, plus am commitmentphobic at the best of times) but he's ever said anything so rude to me, so outright insulting. Do you talk to him like that?
Being married is about agreeing on a few big things, imo. Like if/when you want children. You are thinking in the 'when' frame of mind and he is thinking in the 'if' frame of mind and that means right now that you don't agree about wanting children.
I don't think you're selfish for wanting to agree on this. I do think that he is using that accusation (the worst one to level at a woman! Oh, she's selfish!) to deflect from the fact that he's not on the same page as you about something which has the potential to be a deal-breaker.
Spend the money on Relate, not your wedding, or you might end up spending it on a divorce!. I think they do a sliding scale, btw, so it might be more affordable thank you think.