What next, after finalising components ?

Assuming you've determined a good listening triangle, do nothing else and just listen to your music collection. Familiarize yourself with how your music collection sounds on your new components. Take your time in doing this. It's only after you really know what your system sounds like can you figure out what you need to do next.

BTW, I would address room acoustics first. Keep it minimal.

mo media

in all seriousness, some good liquor and a few new cds will improve your experience more than, say, a power conditioner. it looks like you've got great stuff--personally, i'd kick back and enjoy it

At this point the XLO Reference disk for positioning your speakers will maximize your system's potential. You can it get on Amazon.com.
I've been tweaking my setup for years and this disk helped me refine positioning easily and quickly yielding improvements on the scale of a component upgrade for less than $25.

Do you need a power conditioner? Every time I try a power conditioner it makes the sound worse. So, I can only assume I do not need one. The last one I tried was the Tice Power Block with an isolation transformer and Titan conditioner and they did not improve the sound.
Vibration Control/Isolation can be very powerful, but don't go too far. I tried some Tip Toes under my CD player once and the bass was totally gone. Then I tried Sorbothane feet under the same CD player and the sound became mushy and lacking in detail. I decided it sounded best without either.
The same is true with room treatment. You have to determine if you need it. My listening seat is against a wall. If I turned the volume up past a whisper the sound became congested because of the reflection off of the back wall, so I use 8 Tube Trap half rounds across that wall and my problem is solved. But if I didn't need the room treatment I would never use it.