The best advice to give you: Do not just buy the standard fruit varieties. Do your research, and select the best tasting or remarkable varieties. You may have to mail order small bare root trees in some cases.

If you only buy whatever you find at the local nursery, you will likely have very mundane fruit variety.

To some extent, the type of varieties to get will depend on your climate. You might check out the Raintree nursery catalog, they focus on varieties suitable for the PNW, and carry a huge selection of uncommon varieties. Wait untill the Spring.

Carmine Jewel bush cherry might be a good idea if you like it on the tart side. 'Comice' is the most superb tasting pear, in my opinion, but that variety may be vulnerable to fire blight in your climate. Maybe get a special perry pear variety to make some pear cider.

And remember, where you live is berry heaven. Maybe grow some boysenberries or marrionberry.

King Tompkins and Ashmead's Kernel are two old classic apple varieties with excellent taste. You won't find these apple varieties at the supermarket; they are too tender and juicy and wouldn't store so well.

If you are only planting 4 trees, I would skip a pear. Pears you can get decent at the store because they ripen off the tree. I would just get one self fertile apple. Nothing is better than tree ripe stone fruit, not sure what does well in your area. Figs are great choice too (my 2 year old son loves them) and they will give you fruit quickly. And all kinds of berries if you don't have, kids love them all (blue, black, rasp, mulberry, currants)