I've owned a 996 and have ridden a LOT of different bikes so I can give you my opinion based on my experience.
My 996 was gorgeous. it had $10K in extras on it. I used to ride it on the street and do trackdays. It certainly got the blood flowing and turned heads everywhere. It was good for the attention it drew and getting one excited about cruising around on and hearing the beautiful noise of an opened up Desmo, well anyway, you get the point and know the sound.
That's where the fun for me stops however. I have two major issues with the 916 generation...mechanical, and performance. You have to be aware that all of the 4-valve Ducs up through the 998 had flaking rockers. You don't know which bike will have them and which won't. It seems that not only does Ducati have major quality control issues but so do their suppliers. Mine had flaking rockers twice. When you get that news, you will cry hard and loud. Especially if said flakes wrecked cam lobes. Let's just say that the repair bill could be better spent on oh say, a whole nother cheap bike! Also look for a lot of electrical problems that seem to plague those bikes. The coolant overflow tank will crack and leak. They ALL do. It's just a matter of how many you will replace during the life span of that bike.
Then there's performance. Quite simply they turn like bricks! They are not nimble by any means. They feel good and stable cornering but turning them in requires flicking them early and hard! It takes a lot of muscle to turn them and they feel very sluggish and difficult to corner hard. And yes, I had nice suspension and $2K magnesium wheels that helped a lot but still didn't solve that issue. My current streetbike is a 600rr and it can run circles around a 996. That's not just cornering but it's about 20mph. faster too.
I was at a trackday recently with a friend who was on his 748. I let him take out my Honda for a session. He came back with a gigantic wide-eyed grin that he could not get rid of for about thirty minutes. As soon as he got off my bike, he swore that he was selling his 748 ASAP. Why? because he learned that other bikes turn! oh and go faster.
Around town they are simply crap. They were purpose built for the track and for their time they were great for that but times have changed. And you don't want it for street. It's like buying a monster truck to get groceries.
Having said all that, I do still love the 916 generation superbikes and they are a lot of fun but just not practical at all. And you said that you wanted something sportier. I would recommend the 749 if you are set on a Ducati 4 valve, or a 2 valve supersport. They both handle better than the 916 series. I was pleasantly surprised at how good the 749 felt over the previous generation. But really the best value and most practical would be to buy a 2 valve Supersport. It's a nice mix of peformance and street friendly rideability. Not to mention the 2 valves are Ducati's best motor. Not fastest but most reliable and easy to maintain.
These are just my opinions and observations. I dig Ducati just as much as everyone reading this. If anything, I just want to cation you as to what you are in for so that you don't get soured on the marque. I would rather people get the Ducati that fits them best and for some that may be the 996 but I can say with confidence that I will NEVER buy a 916 generation superbike again.
I have not ridden the new ones but I know that I should not. I have a feeling that I will be even further in debt if I do. I did go to the 848 premier at Delano and sat on it...that pearl white looks hot! They have cheapened down this generation a little to make them more affordable. I'm not sure if there is an S model coming. Gone is the steering damper, dry clutch, adjustable ride height, adjustable rearsets and seating, and they have cheaper body fastners. Now you need tools to remove body. These things could be upgraded or possibly overlooked because the bike looks so hot! >
Good luck with your decision. If you stay with Ducati, great! Just be aware that there are better options to stay with Ducati and stay sporty. [thumbsup]