Eastern Yellow Robin

Hi there,
I went out this afternoon looking for more birds. I wasn't prepared for this one (I was chasing a bird I had never seen before) but he landed reasonably close to me. This is a 4 megapixel crop... I wish I had a 1.4x or 1.7x TC (I thought getting the 500 would stop me saying that
).
Maybe I should have used a larger F stop (maybe f4) to blur the background more?
ISO800, F6.3, 1/320, SB800 (not sure that it fired properlly as the batteries died)
Comments and suggestions welcome.
Paul
I went out this afternoon looking for more birds. I wasn't prepared for this one (I was chasing a bird I had never seen before) but he landed reasonably close to me. This is a 4 megapixel crop... I wish I had a 1.4x or 1.7x TC (I thought getting the 500 would stop me saying that

Maybe I should have used a larger F stop (maybe f4) to blur the background more?
ISO800, F6.3, 1/320, SB800 (not sure that it fired properlly as the batteries died)

Comments and suggestions welcome.
Paul