My Dad is in a smaller (35 bed) nursing home at the lower end of your range (though he does get the funded nursing care element of about £100pw which goes straight to the home - doesn't get CHC). What I like about it is:
All the staff (including the chef and the handyman) know all the residents by name, and the regularly visiting relatives.
The manager and deputy manager are actively involved with residents on a daily basis - they've even done my dad's dressings, and the manager has lent him her personal copy of a local history book.
Getting up and going to bed is at a time of resident's preference
They're bending over backwards to cope with his foibles, for example spending time to help him fill in his own medication sheet to give him confidence that they're giving him all his tablets at the correct dose.
What he doesn't like about it is:
He feels they keep harassing him - he claims that left to himself it takes him 2.5 hours to wash and dress, and if he refuses help they keep coming in to check whether he's finished yet
Some of the staff boss him around - most recently telling him it's not a good idea to keep his juice jug on the floor.
Some of them "treat him like a fool" - sadly he's going to get more of that as his slender grip on reality diminishes.
When he presses his buzzer, someone pops in straight away - but is then likely to say "I'm just dealing with another lady at the moment, I'll be back in a minute" - and then not return for "literally hours" (I suspect 10mins).
Some things are difficult to assess - for example residents are free to wander around the home, which is great, but on the other hand I once had to chivy a resident out of my dad's room.
It would be nice to have a big garden area to walk with him in when I visit, but we can live without. They do have daily activities, but my father hasn't participated yet. There are two lounges with stunning views, but my father spend most of his time in his room (through his choice).
So I suppose what I'm coming down to is what someone said up above - that the important things are the extent to which residents are treated as individuals and their preferences met, and that's more important than the range of facilities that you might get (and pay for) in a larger more expensive home.