I'm a gardening newbie, so excuse the dumb question, but why would you plant when it's dormant?
It's like moving it in its sleep, so you don't disturb it.
You only need to do it with bare-root plants; if you buy your bushes in pots, you can plant them any time, as long as the ground isn't frozen or waterlogged.
If you buy a fruit tree, remember, one in three trees dies in the first year from under-watering.
Why not consider a "family" apple or pear tree. These have more than one variety grafted onto the rootstock.
Should you do so, I'd remind you that strawberries are naturally woodland plants, and you'll be able to plant them underneath a fruit tree.
Although you won't get quite the harvest of strawberries you would if they had the bed to themselves, it should still be worthwhile, and you get fruit in June from the strawberries, and in the autumn from the fruit tree.