Merging two video takes into one or replacing green screen with pictures

[BadDisciple]

Hail all,
I'm relatively new in video editing (done work just with Windows Movie Maker).
I want to get a dedicated Video Editing software which will be able to do variety of tasks, including
merging two video takes into one and also replacing green screen with pictures!
Can anyone advice what best software exists for that kind of work?
I've seen general information about Lightworks, Cyberlink PowerDirector, Adobe Premiere Pro CC,
Avid Media Composer 7 or Sony Vegas... but I don't know if all of them do what I mention above.
Thanks in advance!

Best vibes.
------------------------------------------------------------
Bad Disciple
EN EIDA OTI OUDEN EIDA
(One I saw that none I saw.) Socrates

[Baldrick]

Welcome! But please do NOT cross post. I removed your other thread.

[smrpix]

They will all do what you want. Power director is kind of a toy compared to the others. Vegas has less expensive versions "Movie Studio" if price is a concern. Avid is the most picky about system specs. All have free trials.

[BadDisciple]

Welcome! But please do NOT cross post. I removed your other thread.

Ok sorry, I didn't imagine that could be any problem.

[BadDisciple]

They will all do what you want. Power director is kind of a toy compared to the others. Vegas has less expensive versions "Movie Studio" if price is a concern. Avid is the most picky about system specs. All have free trials.

Nice to know that. Thanks for your help!