go with a nice chocolate sponge, make it in advance of putting the cake together.
fresh strawberry with pastry cream lightened with whipped cream and stablized with gelain.
Swiss meringue butter cream made with butter and perhaps a hint of shortening to insure stablitiy.
Use dowel sticks and cardboard or wood drums to hold your cake up.
put your cake together the day before and refrig to set the creams and allow the flavors to meld together.
there are wedding cake stands/kits you can get at the local hobby stores.