Claymore would have been a good choice if you still had it. However you can still buy a Bastard Sword from the Parish Blacksmith and it's a decent weapon.
If you are going for that Knight type build, why not stick with the longsword? It doesn't scale that great with anything but you can get the to drop easy so you can have multiple to try different upgrade paths. It has a pretty good moveset including a pierce attack for R2.
Balder Side Sword would fit into a knight type of build as well but since it scales with dex you could always upgrade to something that doesn't scale with stats like an elemental, or even a Chaos.
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