Best concealed cistern

[Gt5500]

What's everyones top choice for a dual flush concealed cistern? It's going into a 600 by 400 unit with access through the dummy drawer front. The toilet will be a wall hung on a low height frame.
The reason I don't want a combined frame and cistern is because the huge flush plates will not fit the unit.

 

[townfanjon]

Only ones I use are Dudley Advantage or Grohe Adagio

 

[Gt5500]

Thanks, I was looking at the grohe, I've seen some reports of the flush pipe leaking, have you had any issues?
I see lots of recommendations for the fluidmaster, the thing that puts me off those is the flush plate is not as slick looking as the grohe.

 

[SimonG]

Dudley phantom for me.