John, you will not be able to completely eliminate sugar, even using splenda, because the science part of the baking will not let you. Go to Splenda.com for some excellent recipes and just remember to eat your cake in moderation

I have a book on my shelf called "Fantastic Food with Splenda" by Marlene Koch (says 'the author of Unbelievable Desserts with Splenda')
I have NEVER made anything form this book, but would be glad to share some of the recipes with you. It lists 18 recipes n the index under Cake

I also have a book titled "Baking with Splenda" by JoAnna M Lund, again, never used. There seems to be about 40 listed under 'cake'

They seem to have the simple, to the 'more things added' type
Are you looking for a 'basic yellow' cake, or something a bit more?

These books could not have been that expensive, or I wouldn't have bought them!