I want to buy a K2 for my bedroom setup to record male vocals.
Yes. It doesn't take much computer power by today's standards to record a few tracks of audio. And the Focusrite is a competent interface. You could probably get just as good a result with a mic half the price though. Above a certain price level mics might sound different, but not really 'better'.
Have you got a really nice-sounding room to record in? That makes a lot of difference.