This is a forum populated by enthusiasts. So you are asking this question to a bunch of gear nuts who will sell their own granny to get the latest and greatest super-expensive board. So your post is like if you went onto a supercar owner's forum and asked them which cheap family SUV you should buy.
That's why you aren't getting much in the way of reply.
My advice to you is to spend as much as you can afford, and to get something that looks pretty. Many of the big brands (who tend to make boards that will last) make boards aimed at women now. I particularly like the designs by Sonni Honscheid, the Takine range:
www.totalsup.com/news/starboards-new-tikhine-range-sonnie-honscheid-creation/The reason I emphasise the graphic design isn't because I'm a sexist pig. It is because even if your daughters don't care about the colour etc, if you have bought something that is obviously aimed at them not you, it will show that you put some care into the purchase and were thinking about *them* when you bought them. Ditto my comment about buying a good brand board. They'll love you for that, even if you buy them a board which is eg. 10 litres too little or too much volume than is ideal for them.
Ok, so I bet you wish you hadn't asked now