We have recently moved from Allen, but there are some good choices. You should definitely go and see the centers and ask alot of questions. Take your time and look at the children, the staff and the rooms carefully to get a good first instinct.
Creme de la Creme off 75 and McDermott is pricey but has lots of bells and whistles, very secure, VERY clean, always new toys and books.
Primrose is also a great school off 75 and McDermott on Tatum.
There's a new Montessori that opened off 75 and Exchange as you head toward Watters. We looked there when we were moving up farther north of where we were. They seemed very nice and very clean, but didn't offer the type of curriculum we were looking for.
Everyone has their own experiences and opinions, but I went into Twin Oaks and Holly Oaks in Allen and personally, I wonder how they are still open. You should go visit places and see for yourself. Everyone has stories...hopefully you'll get enough feedback to start looking. You can also go on the dfps website or child care licensing and bring up your new zip and it will give you a listing of the daycares in the area.
Good luck!