Joshua Ferris, Then We Came To The End (if you can find it. Books Etc. said "eh? That's not on our inventory" - despite its being Sunday Times's best book of the best books of the year)
I want to read Charlotte Mendelson's When We Were Bad - sounds like it has Jack Rosenthal vibes
One of David Mitchell's earlier books - maybe Number 9 Dream. Not the current one (Black Swan Green).