When playing as the English, I love Fyrdmen - absolutely invaluable in the earlier parts of the campaign, and can still hold their own in High, if used sensibly....

Chivalric footknights are great to have as well.

Steppe Cavalry are great speedy little flankers.

Huscarles and beserkers are good fun in VI - also Huscarles seem to keep on keeping on in terms of usefulness well past 1205....

I like the old Turcopoles as well, but maybe that is just a horse archer thing...