The Concord is fine, I sometimes use it as a travel razor, (over a year since I last used a DE). I haven't used the Lord L6, I have used the previous iteration of the Lord, not very good, but I've heard that the head on the L6 is a big improvement.
I think one of the best current razors for the money is the EJ89.
I've used all with Feather blades (I bought two 100 packs, they're dirt cheap here in the supermarkets)