Phantom Classic vs reactor

[Le petit français Devialet]

Hi, 

I am new on the forum and also french so excuse my language   

So I am looking to buy a Devialet phantom : 

Witch is the best between : 

A used phantom classic 
A used reactor 900 
A brand new reactor 600 

And my usage is : 

Most of the time in a bedroom of 130 square feet 
Any some time in party’s in a 450 square feet room ( and in that case the sound has to be very powerful) 
I like to listen to music pretty loud but not blasting 

Thanks for your reply’s