Hey welcome back to the party Pzia!
To get you started rather than recommend X server what I do is you will see an option at top of the page for MirTracks.
Will give you the listing of all mir 2 and mir 3 servers including when they launched and how popular they are.
Can then use that to narrow down your selctional and then pop up over to the server ad section on the forums to see which advert catch's your eye the most.
Also worth a while looking at the up and coming section in case one of them catch your eye too