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
128x128lobinero
At the price point you are considering ($5000) there are integrated amps that are quite competitive with same amount spent on separates. 

The issue I see is that your are considering the purchase of different speakers. There are many amps that can drive the Vandys that may not be suitable for others (Magnapans). 

If I were building a system around a pair of speakers I knew were to stay, I would probably look for an integrated amp unless use of separates would allow for better system placement within the room.

Not knowing which speaker I might try in the future would cause me to go in the direction of separates. I would consider mating a tube preamp with whatever (SS or tube) best serves my current speakers.
After decades of separates including McIntosh, Krell Classe I have opted for a Hegel H590. It has a to die for DAC and the amp technology of the H30. A bonus, it does a terrific job streaming with airplay, audirvana, Qobuz, and others. I don’t miss the complexity and extra cables of separates. Give it some consideration. This amp is a winner. 
There are now some excellent quality integrated units.  One that I liked almost as much as the separate was the VAC Sigma170i .  Yes, that's an expensive unit but it is high quality throughout with optional phono.  I have the room and cabling for separates but if I had to limit my cabling costs, a great integrated would do.  I've also heard a great Luxman integrated.  I'd get a separate DAC because that technology changes too quickly.
while it is true that separates typically sound better, each component requires a high quality power cord and interconnect to benefit from the upgrade, with careful attention to the base each component rests on for proper isolation

If your budget doesn't allow for a sizeable expenditure in cables and PCs, you are much better off with a nice integrated.

There are some fantastic class D integrateds; Hattor and Nord come to mind.

hth
Stick to a Tube Pre-amp if you want to save your self from headaches (Listeners Fatigue) 

An Excellent Choice would be the MP-3 from Atma-Sphere.