A dilemma?

I'm talking with a family that I think would be a super great match. They've got everything I've been looking for. Our emails are going super slow though. The mom has told me she thinks it could be a great match and she has a good feeling about it though. So that leaves me hanging....

I've been talking with other families during the time I've been emailing with fam #1. I can't figure out if I should tell them, "hey, I'm seriously considering another family, but if that doesn't work out I'd love to talk to you more" or just not mention it and hope I don't look like I'm wasting their time if something does end up working out with fam #1.

in the last week I've seriously considered families in
-Amsterdam
-China
-Poland
-Turkey
and Italy again.

but I keep going back to fam #1 and just being all "this would be soooo freaking perfect" and just holding out hope that waiting around for more emails to come through isn't just a waste of my time.

Maybe I'm being too picky. But in the end being too picky is probably a good thing and I wont be in over my head?