Northstar for the cherry. It doesn't get very big and produces plenty.
I'm not sure if sweet cherries would be an option for you, but they definitely would be more work.

I think you need to give more information for your apple desires. Otherwise all you're going to get is people posting their favorite apple.
Do you want pie, fresh eating, storage, rarities, heirlooms.
If you have no idea you could go to the store and try some.
Ordering now won't do you any good so you have all summer to sample.

Hi Summertime2006-
For the apple, do you have any pollinators near by? (Other people with apple trees? Crab apple trees?) If not, you may want to look at a multigrafted apple tree (3-1, 5-1, etc) where multiple varieties are grafted on the same tree. My local nursery carries them. Or, you could plant your desired variety and then graft on some other-variety scions of your choice to get the same result.
-Glenn

If you want a cherry tree that doesn't get too huge, you probably don't want a sweet cherry. You want the species called sour, tart, or pie cherry. The classic variety is Montmorency. I had one that produced lots of fruit with no trouble for years. I hear there are some new varieties with fruit sweet enough to eat right off the tree, but I haven't tried them.

Most places, it's impossible to grow nice apples without spraying various chemicals on them, so decide if you're willing to do that. If so, you have a ridiculous number of choices, so you have to narrow it down by what you like in an apple. If you don't want to spray, there are some new disease-resistant varieties, but even they can have insect problems. Anyway, I really like Goldrush, because I like crunchy-hard, intensely sweet and tart apples, but that's just my own preference. Is there a farm market near you where you can taste local apples this fall?

I have Starkrimson Sweet Cherry. It is self-pollinating and only grows 12-14 ft tall. It came from Stark Brothers. We really like it.

Check Evan Cherry. It is hardy in Canadian Prairies and its sweetness is between the sweet and tart cherries. It is self-pllinating. It is available from St Lawrence nurseries ( http://www.sln.potsdam.ny.us/ ).
If you want self-pollinating sweet cherry, then check "Stella". It is hardy enough for Zone 5 but may lose buds in more than normal cold years or late frosts.

BTW, St Lawrence nurseries sells Evan Cherry by the name 'bali"