A small Magnolia Tree (preferably soulangeana)

Hello, I am wishing to buy a magnolia tree suitable for the garden. Our garden is relatively small (approx. 7 by 5metres.) We already have many plants, flowers, and vegetables growing at the moment. At the side, we have an aisle which has nothing growing whatsoever. This part is overshadowed by the fence, and therefore extremely shady.
So, I was wondering if it would be possible to plant a magnolia tree somewhere on this side. There used to be a relatively large tree there, before, but then it died- and fell down.
I have been looking around, and prefer M.x Soulangeana. However this seems like it would be too wide. I know there is 'Stellata' that would be suitable for a smaller garden, however I do really like the Soulangeana genus.
Please reply, and could anyone list a few varieties of magnolia that would be small, and grow in those conditions. N.B. The soil that we have is clay.

 

could you consider planting in a large pot, you can keep it sheltered and sunny then move it where you want to, it will be a few years be4 it grows to full size

 

thanks, that would be a good idea. But, apparently it takes a year or so to flower.

 

When it flowers depends on the age of the plant. If you visit the garden centres soon you can see them in flower. Usually they come about 3' tall and these are of flowering age. I have had 'galaxy' [pink] and a yellow one called 'butterfly' I think, both these seemed not to spread so much as others. If it's in a shady place it should tend to grow up rather than out anyway. Have a look at this site:
http://www.duchyofcornwallnursery.co.uk/plantshop_list.asp?ptid=8
It describes flowers and habit. Some prefer acid soil.

 

I have a magnolia called 'Susan' Which is very nice and isn't growing very big. If it does they can be easily pruned.