Cord covers, painted the color of your walls and then painted the color of your ceiling will hide the wire from wall plug to over the center of your table. Not the best, but I've done it in an 1820 half Cape and it worked out okay...

You can use a swag, plug in chandelier. These chandeliers are specifically made so that you can hang fixture from hook on ceiling - and plug into wall outlet. It is also possible to have a chandelier converted to a swag - but you would need to consult professionals on that. There are many styles of swag chandeliers available. You can do a search. This is just one example: http://www.gallery803.com/ProductDetail.aspx?ProductID=437738

Whatever chandelier you choose - just make sure it is dimmable.

A good electrician should be able to help.

You can see a wide range of chandeliers on the site http://alumcommerce.com/