i am in india , everything is F***in expensive .

mic we can buy but a separate hardware for recording audio is a bit expensive :|

I've a very low end pc , and Premier works very nicely , real time playback is nice in Premier , i've used vegas too , but wasn't as good as premier ...

For A Short 1080 is good , it is also easy to edit on even a lower end pc ...

Black Magic Cinema Camera MFT

Shoot a scene of computer screen , and if you like it then keep it , otherwise do a screen recording and replace it in mocha after effects ( by tracking ) and mask any physical interference of actor or any object :)