There's been some discussion in the past about whether humans or half-elves (or sometimes a third option) are the best race for multiclassing, but I don't recall seeing discussions about the first class for combinations, so I thought I'd throw the question out there. (If I've somehow missed an endless debate, please disregard this post!) Let me preface this by saying that, as with everything else, the only thing that really matters is what you think is best for your character concept, and just about all of the combinations are viable and entertaining, whether you take one feat or all of them and a paragon path.
I would submit that Warlord is the best base class for a multiclasser, in part because they have a wide range of options. They get in-class benefits from at least one of the potential primary scores (Strength, Intelligence and Charisma) for every other class, except Rogue---although they use both of the rogue's secondary scores. In addition, nearly all of the benefits of the Warlord's own paragon paths are independent of class features (only two grant benefits for inspiring word, and multiclassers will have it anyway, even if it's not as often); that's not only a benefit for other classes dipping into Warlord. For example, both Knight Commander and Sword Marshal emphasize frontline melee aspects of the class, and a Warlord with a few fighter or paladin options will likely enjoy the paths even more.
There's also been plenty of talk about how Tactical Warlords are good for multiclassing into Wizard, but the Inspring Warlord and the Warlock's more controller-ish powers also mesh really well. Many of the Star and Fey Pacts' Cha powers involve tweaking enemy rolls or making them attack their own allies; this meshes nicely with the Warlord's focus on more indirect tactics. In addition, most of the Warlock's utilities are good for getting to a party member to lend them a hand, or for staying up to continue providing support.
So what do others think?
I would submit that Warlord is the best base class for a multiclasser, in part because they have a wide range of options. They get in-class benefits from at least one of the potential primary scores (Strength, Intelligence and Charisma) for every other class, except Rogue---although they use both of the rogue's secondary scores. In addition, nearly all of the benefits of the Warlord's own paragon paths are independent of class features (only two grant benefits for inspiring word, and multiclassers will have it anyway, even if it's not as often); that's not only a benefit for other classes dipping into Warlord. For example, both Knight Commander and Sword Marshal emphasize frontline melee aspects of the class, and a Warlord with a few fighter or paladin options will likely enjoy the paths even more.
There's also been plenty of talk about how Tactical Warlords are good for multiclassing into Wizard, but the Inspring Warlord and the Warlock's more controller-ish powers also mesh really well. Many of the Star and Fey Pacts' Cha powers involve tweaking enemy rolls or making them attack their own allies; this meshes nicely with the Warlord's focus on more indirect tactics. In addition, most of the Warlock's utilities are good for getting to a party member to lend them a hand, or for staying up to continue providing support.
So what do others think?