Horwill & Saili as a guess.
Not sure about Saili - when you consider that Robbo, Brownie and DC were all regularly playing for England when Saili signed and also with his injury record at Munster as unlucky it was, I reckon we got him on a decent rate. He is an ex-All Black, but didn't ever play for them on a regular basis and has a handful of caps to his name relative to the 3 England guys above.
Edit: less than a handful of caps for the All Blacks - 2 to be precise!