A4 - Still a lot of fun - Enough space - Slightly less cool styling, but felt it was better made and designed than A4. More sleek and slightly more elagant, but still cool. S4 - Most fun to drive. She had a blast while driving it. - Looked the best - Styling right there with the A4 in terms of quality and lay out, except she said it felt a bit more fun and younger. Best of both worlds. She got the S4. The reason the S4 is more fun is because it has a 340 bhp 4.2 liter V8 under the bonnet, not really comparable to the A4's 200 bhp 2.0 liter Turbo... Also it has better suspension, but if I wanted the "˜S4' look, I would have bought an A4 2.0T with the S-Line package (which looks exactly like the S4, sans chrome mirrors and S4 wheels) with Quattro and chipped it, which would make it faster than the 3.2, while still costing easily $13-15k less than the S4. Now the RS4 on the other hand... I should have gotten Quattro...oh, well next car... Jon.