Lord, Wild Rider Kindred, Annoyance of Netlings/Glittering Scales, Spear of Twilight, Talisman of Preservation, Elven Steed
Grants the Lord a 5+/4++ Armour/Ward Save Combination. What you want to do is decide whether you want your Lord to be in a challenge (against high damage/resilience enemies i.e Chaos Warriors), or against Hordes (sub WS3, S3, T3, 5+ AS or less).
If it's Challenges you want to let the Lord survive in, then there's no competition - Annoyance HAS to go in. Against WS3 or under, you're being hit on 5's. Give them -1 to hit in combat, you're being hit on 6's all the time.
Spear of Twilight grants Killing Blow, useful against Armour, as S5 fails to cut the juice as Anti Armour, especially as S5 Wild Riders have a grand old 6 Attacks on the charge.
Alternatively, don't bother with combat.
Highborn, Wardancer, Blades of Loec, Annoyance of Netlings, Potion of Strength Challenge Material - when charging, use the Woven Mist spell, and trigger potion of strength when challenging. That gives you 5 Reroll to hit WS7 attacks striking first at S8 reroll failed to wound attacks.
Although combat Lords look awesome (The Lord on Elf steed is a favourite), the Alter Gunner Highborn is by far the best - Highborn, Alter, Bow of Loren, Arcane Arrow, and then either Great Weapon+Amber Pendant(ASL to the pair of you, simultaneous striking), or Shield of Ptolos+The Other Tricksters Shard+Great Weapon (Lose simultaneous striking, but gain 1+ AS versus Ranged attacks, and enemies reroll successful Ward saves).
This gives you 5 Shots Ignoring Armour Saves.