Ant's T-28 B and C have speed brakes, a great VC, great visibility, but aren't free. The A model is though. But the B/C package (you get both) is $19.95 US. And there is a paint kit. And it runs in both FSX and P3D. (
http://www.antsairplanes.com/trojan.html)
But, at
http://www.carenado.com, they have three planes that might be suitable - Pitts S-2S, the SU-26, and an Extra 300. All have one blank texture and all are $19.95 US. All are also for both FSX and P3D so you are basically getting two planes for the price of one. I love the Carenado/Alabeo aircraft though they do tend to impact frame rates some. I have the Pitts and it is a nice flying plane and fun to fly. I also have the Waco YMF5 but it's not aerobatic. Fun to fly and beautiful, but no inverted flight and a bit underpowered.
The T-28, SU-26, and Extra 300 would all have great vis. The Pitts would have less being a biplane but it's not bad speaking from experience.
Maybe we should build a list and then vote?
I would be happy with any of these. I'm sure there are other good candidates as well but am not familiar with them to recommend. Anyone else got suggestions?