(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 stuck in a rut
• be tailor-made
• be talking out of both sides of mouth
• be talking out of both sides of your mouth
• be talking through hat
• be talking through your hat
• be tanked up
• be ten a penny
• be thankful for small mercies
• be that as it may
• be the armpit of the universe
• be the armpit of the world
• be the bee's knees
• be the best of a bad bunch
• be the best of a bad lot
• be the brains behind
• be the brains behind something
• be the cat's whiskers
• be the dead spit of
• be the dead spit of someone
• be the end of the line
• be the end of the road
• be the end of the world
• be the exception that proves the rule
• be the full quid