There are a few folding ones here that I could see working ...
Folding Chairs and Tables | Foldable Furniture at HomeDecorators.com
Otherwise, I'm out of (quick) ideas too for something traditionally styled that stacks too.
Do note that if you were to replace the table top, you'd give up the expandable feature (with the hidden leaf). The thing is, it's the base that really makes the table traditional. Perhaps replacing the base with one from the Billsta (I believe they're available separately) plus some modern styled stacking chairs won't make it look so out of place.
IKEA | Café furniture | Café tables | BILLSTA | Table (http://www.ikea.com/us/en/catalog/products/S79831453 - broken link)
(FWIW, I have the same Liatorp table too.)