I'm sure 200 BHP is possible, but would it live? I doubt it. I'm also sure that 150 BHP is possible with some serious work and it would live. I believe Devi is already pushing the 140 BHP (rear wheel) without any head work yet.
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Nitrous alone may push you up to 160 BHP or so, but I doubt it would be very ridable. I also seem to remember a turbo 1050 that had a claimed 175 at the rear wheel. Again, this would indicate that 200 is possible, but would it live?
With the mods that I've done so far I'm really hoping for 125-130 rear wheel and I think I may be close. Much more than that is probably silly for a daily rider. I'm waiting to see how Devi does with the head machining and the cams though. 160 naturally aspirated would be fantastic. If anyone can do it, he can.