I prefer a flat torque curve, where you're accelerating like a bat out of hell anywhere in the rev range. Top end is enjoyable though, because having an engine have a rev limit that's, say, 6000 rpms and not even making power anywhere near it sucks. I dislike when something i'm driving falls on it's face. The mazdaspeed 3 is notorious for this, if you rev it to 6500 rpms, it's much slower than if you shifted at 5700 rpms instead.
For the way your engine is designed, when you go for big power, you are going to lose low end. This is for multiple reasons.
1.) the intake manifold profile for top end power will always lose bottom end power
2.) the cam profiles for top end power are going to have cam lobes too large for efficient intake and exhaust velocity at low rpms. This coupled with the intake manifold make for low end loss.
This is not to say that you are going to be gutless down low, but losing torque down low means you moved it up top. Any race engine you see is going to carry it's torque high into the rev range and not drop it off 80% there.