[masraum]

We don't have all of the factors that need to be considered.
How much of a factor is co$t?
What transmission?
What rear gear?
Can the rest of the car handle the power in the 390?
etc...

Based on the information that we do have, I would say that you should NOT get the 300hp version. It's got less power through a lot of the rpm range that you'd be using.

But if you compare the 235 and the 390, then you can see that the 390 always has AT LEAST the same power as the 235, but sometimes quite a bit more. So if you ever want to use more, you can. And even with the 390, you can still short shift at 4k if you want. If the cost increase isn't an issue, then the 390 will potentially be more fun if you ever do want to dip into the loud pedal a bit deeper.