raintree has sweet cherries on gisela 5 - thats about 6-10 ft range.

remember to pick a self fertile one if you are only planting one.

http://www.raintreenursery.com/catalog/producttype.cfm?producttype=Cherries-Sweet

and another
http://www.millernurseries.com/cart.php?m=product_detail&p=188

You don't indicate where you live in your post or profile. Performance of cherries will vary greatly depending on where you live.

From what I understand (this is my first year growing cherries), the sweet cherry trees tend to be a bit more finicky with the soil that pie cherry trees.

You might consider
Dwarf North Star Cherry or Dwarf Montmorency Cherry

Adams County Nursery has Gisela rootstock for some of their sweet cherries. Edible Landscaping has a few on Krymst 5 rootstock. You can order them for spring delivery.