(you) couldn't have asked for (anything) more

this is the best thing of its type you can imagine.

My career has been terrific. I couldn't have asked for more.

Our daughter's babysitter turned out to be wonderful — we couldn't have asked for anything better.

• be on the game
• be on the heavy side
• be on the horns of a dilemma
• be on the large side
• be on the level
• be on the line
• be on the loose
• be on the march
• be on the mend
• be on the money
• be on the piss
• be on the ragged edge
• be on the razzle
• be on the receiving end
• be on the right lines
• be on the right side of
• be on the right track
• be on the rocks
• be on the ropes
• be on the run
• be on the safe side
• be on the same wavelength
• be on the scrap heap
• be on the side
• be on the ... side