Hey vti_79,
Well, it's a fact that 2-stroke is better than 4-stroke in terms of
performance and here we're comparing with the same displacement,
150cc.
For me, I would choose SP over the new CBR, basically becoz it's a
2-stroke bike.. 
I can assure you that you're regret if you go for a brand new CBR
150....
As wat you mentioned, you know you'll speed on straight roads and
this had indeed shown that you have the need for speed,
agree?
It's juz my remarks and opinions, dont get irritated by it, ya?

Morever, there are lots of bo liao riders in our country now and
would you be able to tolerate their stupid acts and moves on you
and especially when you pillon your gf....?
I'm sure "they" are waiting on their next prey; 4-stroke CBR
150
FYI, 2-stroke bikes would not be around in the near future, look at
the MotoGP.... .
So betta get your hands on the light and mean 2-stroke bike while
you can, Honda NSR 150 SP, that has been claiming lots of innocent
and unfortunate lives....
Yet, undoubtly a great machine ever created for passion and
speed.