Don't want a Pitts or christen-eagle or a totally specialized one like that.
You say that now.
BTW, when Curtis Pitts designed the first Pitts in the 40's, he wasn't looking for a "specialized" aerobatic airplane, he just felt a sport biplane could be designed to handle better than the dumptruck-like Wacos and Stearmans that were around then. Don't get me wrong, I love Wacos and Stearmans.
So don't think of a Pitts or Eagle as "totally specialized". Think of them as simply one aircraft on the wide-ranging aerobatic performance spectrum. There are many aircraft types on this spectrum...from a Clipped Cub to an MX-S. The Pitts/Eagle is about half-way in between. The higher you get on this spectrum, the less sense it makes to own the airplane for anything besides pure aerobatics. And the Super Decathlon is "specifically" built for aerobatics, given the load limits and inverted fuel/oil systems. It's simply a little lower on the performance continuum. It's also a very easy-handling, classic taildragger, comfortable, with good visibility and a combination of speed, ruggedness and short-field capability. So it has appeal to recreational aerobatic pilots who want an airplane for more than just aerobatics. It's also a great first aerobatic airplane, and very good for learning the basics. But don't let anyone tell you a Pitts/Eagle is inappropriate as a first acro plane. It all comes down to good training and good judgment.
Regarding aerobatic airplanes, you say you "don't know much about them". The real question is how much do you REALLY like aerobatics. Before getting started, some folks like the idea of it, but don't care for the reality of it. Others get hooked for life. How much aerobatic experience do you have? If you have little-to-none, you're putting the cart before the horse a bit regarding the question of which airplane to buy. You need enough training and experience to know IF you will really have a lasting interest, and what kind of aerobatics you want to pursue. Some only ever care to occasionally flop around with lazy positive G loops and rolls. Others become G junkies...positive and negative G. That will influence your purchase decision.
And BTW, don't let your first experience with negative G turn you off it. Lots of people say "I don't like hanging from the straps" after doing it once or twice. Most people feel that way at first. But like any sort of G, you develop a tolerance. Get used to it, and flying along inverted at -1G becomes as normal and comfortable as upright level flight. But you can't go wrong starting with a Super D. There are plenty of other airplanes out there, with lots of room to upgrade performance if you like.
Eric