I used to own a very large hardware synth setup. At one point had 53 keyboards and more rack mounted stuff. I have owned all the big name stuff too. But the soft synth world is amazing to say the least. I am very happy with how they sound.
For those who think soft synths are nowhere as good as the real deal you are simply wrong and you simply have not heard the right VST's yet.
Arturia stuff will give you the analog sound well and truly, end of story.
(Mini Moog and Little Phatty yes all of them ) I use a range of soft synths myself. Camel Audio Alchemy has got be one of the best out there. I highly recommend you check it out. The sound libraries are amazing and it just sounds killer. Native make some killer instruments too. Prism, FM8, Absynth etc..it goes on Uhe make some amazing stuff.
There are some very good free VST's too. Synth1 and Superwave P8 are really excellent.
Omnispehere is not where it is at. It is overpriced and the patches are so complex you cannot use them! The designer has lost the plot there. You are much better off using a far less complicated sounding VST and layering things up yourself to create the rich texture you are after. Alchemy can do all the atmospheric stuff easily as well as Ominsphere but it offers much more.
Korg make some fantastic VST's too. They have modelled their own analog stuff very very very well. Their M1 and Wavestation plugins are simply breathtaking. One reviewer put the Wavestation VST as better than the original. I had both for a while and I agreed with him. The plugin sounds ridiculous!
And remember it is still the music itself that is the most important, If the music is really great then the listener is not going to sit back and think Hmmm he has done all that with soft synths! If the music is great and touches the listener emotionally it has achieved what it has intended to do. That fact that music may have been made with hardware of software is actually of no consequence.