What about the brown heater shield?
Heater Shield
weight 5.5
requirement 3
hit points 410
body armor 12
spd rtng 96
shield width 22
shield height 39
3,156 gold
It has the same hitpoints as the huscarl and only a little less body armor. If you fight against shieldbraker (axes, ...) you need hps and not armor. The heater is also very fast, 96 compared to the 81 of the huscarl. But you can get an arrow in your feet and it is not as good as the huscarl against side attacks.
Think about heirlooming a shield. That increases hit points and armor, but not speed.
I would not use a shield with high armor, and very few hp. The knightly heater and the buckler (and others) break very fast against shieldbreaker.
I would also skill the shield skill above the shield minimum. I tested it (I crushed the same shield with different shield skill levels) and it seems you get about 8-10% durability for each shield point (yeah... it will be faster also).
Edit:
Test the Norman 480 hp shield... last long.