Amp - preamp or integrated


This topic has appeared in the past but I like to hear audiophile suggestions specially if they honest. I currently have the Rogue Chronus Magnum II. With Vandersteen 2 sig. Soon I will sell the house and will have some extra $ for upgrades. I have 4 questions:

Is the amp/ pre amp a better way to go than integrated? Two choices Rogue and Parasound.
Is the mono blocks / preamp an even better way to go?
If I decide to go with mono blocks, due budget considerations , I will be looking at used or an small company/audio engineer where I can keep the cost under 3000. If I go with a small company product, how do I know it is a good quality prod. Vs big companies like Rogue etc?

All your comments to all or any of my questions is highly appreciated. Thanks
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I must clarify when I say " better way to go" it means sonically/ musically. 
I prefer separates. I like the fact that each component is designed to do one specific thing. An integrated can generate crosstalk and/or noise between its sections. Also, if something goes wrong with the integrated, then the entire unit has to be sent for repair ... no more music. With separates, if one component fails, then you can sub in another and continue the party.
Are mono blocks any better? Its just separating the amplification into two units instead of one.