I always liked the original Space Marine Land Speeder, which a version, the Proteus Pattern is available from Forge World.
Larger and more heavily armoured than the common pattern of Land Speeder, the Javelin Attack Speeder is a nigh-irreplaceable relic of a bygone age of technological mastery. Gravitic nullification plates, the secret of whose production and maintenance have long since been lost, allow the Javelin to mount an array of heavy weaponry more akin to a heavy tank destroyer than a nimble Land Speeder, allowing them to make pinpoint strikes on enemy armour or infantry with devastating lascannon or missile barrage. Those Chapters of Space Marines whose histories stretch back into the grim days of the Imperium’s founding may, if they are fortunate, still possess a few justly revered Javelins within the sanctified depths of their armouries.
This version is similar to that original, but reminds me of the plastic Epic version.