Quite a few planes do 400 at 5k. Actually, I think every one of the fastest 5 planes on the deck will do 400 at 5k.
I honestly don't think any prop planes need to be perked. With the La-7, the "performance bar" has been set to the level of the Tempest. Ok, maybe the Tempest would need to stay perked, since it performs almost as well as an La-7, but is a tad faster and has Hizookas. That'd be a pain in the bellybutton if the arena was full of timid Tempests.
The Spit 14 really shouldn't be perked in my opinion. It is roughly on par with the 109G-10, except with better guns and slightly worse performance (kinda like Tempest vs La-7). The Spit 14 is no Spit 5... it doesn't turn anywhere near that well. If the Spit 14 was unperked, I bet you'd see bazillions of them for a month or so, until people started fighting in it and got raped by those who stayed with the Spit 5 and Niki. Then it would drop down to around G-10 levels.
The Ta-152 would still see almost no use if it was unperked, it is inferior to the 109G-10 from the deck all the way up to 30k or so, and it is slower than the D-9 (although marginally more manueverable once you empty the wing tanks) up to ~25k.
The F4U-4 would see some use if it was unperked, it is a pretty nice little ride. I don't think it performs quite as well as the G-10 (or La-7), but it is markedly better than the F4U-1D. I imagine the Chog would see more use than the F4U-4 if both were unperked.
I'm not really certain about the P-47N, but I suspect it will fall in the Ta-152 category (i.e. nobody is going to fly it even if it isn't perked).
Damn, I actually just looked it up and I was completely wrong. The only unperked plane we have that does 400 at 5k is the La-7 (at ~410). The G-10 comes pretty close, not sure if it actually gets it or not. The D-9 makes about 390 or so. So yea... 400 at 5k would be pretty nice, although probably not enough to save it from the pack, depending on how the acceleration is.
