Quantum leap East West samples your opinions?

[Musicman2008]

Quantum leap is having a sale where you buy 1 library you get 1 free .

Not all libraries are included in this deal but the 2 I might want to look into are Colossus and Ministry of rock.
I want Goliath but it is not part of this 2 for 1 deal, I will upgrade to Goliath in the future though.
I am new to sample Libraries.
I have been using a Motif Es 6 to compose the last couple of years but now I want something that sounds like the real deal.
I am also upgrading my computer to a Mac pro 2.8 8 core with RAM that I will upgrade to run these samples.

I produce rock and pop music. I play piano keyboard and guitar and bass. I want samples that sound realistic for strings, pianos, guitars, drums and bass. I want to fool people into thinking its a real band. Can I do it with these libraries.

Colossus is $595 so for $595 I get Colossus and Ministry of rock is this a good deal and then I will upgrade to Goliath.

Have you used these samples in the rock pop genre?
Are there any other samples libraries for this genre that I should also look at?
What are your opinions?

Thank you in advance.