My .10 €:
The last part of GDL trilogy goes a bit into the background of ComStar (as the plot revolves around a race to find a Star League era memory core). Also, they play a pivotal role in the Warrior trilogy, which is also a good read and introduces you to the concept of "stackpoling" (not to mention the Phantom Mech Ability).
The Sword and the Dagger is nice 100% clan-free (even Dragoons-free) product, except it is the other of the two BT books featuring sentient aliens (the other being that which shall not be named). It also features Mechs doing backflipping ninja somersaults while firing at two separate targets and stuff, plus the most overly complicated supervillain plot ever (granted, the whole scheme was thought out by the certifiably insane Max Liao, but still).
Wolves on the Border and Heir to the Dragon contain obviously Dragoons, otherwise there's quite a lot of Drac stuff and are less boardgamey than GDL books, without being Sword and the Dagger goofy.
Close Quarters, Hearts of Chaos, and Black Dragon are IMO among the best BT books, Clans are only a minor sideline here (only present in a couple of scenes). Actually, most of the action takes place outside 'Mechs and contains many memorable characters. Also manipulative storytelling, but at least they evoked actual feelings which is supposed to be a plus.
Double-Blind has zero Clans, though it is only a passable Lawrence of Arabia meets Dune pastiche.
Binding Force, Threads of Ambition, Killing Fields, lots of Liao stuff plus inner workings of a Warrior House, average on BT scale.
By Blood Betrayed, very pulpy and predictable plot, but takes place in Periphery, where even a single 'Mech still is a force to be reckoned with. OK... if you don't expect too much.
Dagger Point. ELH takes over a planet from the Capellans who wage a brutal guerrilla war. Does not even try to hide that it is a Vietnam War analogy, but is at least a bit less naïve than Ideal War which causes much more facepalm, especially when clumsy talking heads start dissecting the Arthurian mythic cycle and then you realize that this is "King Arthur in Vietnam in Space" (except that there is a nice three-way between FWL, Wobbies and rebels featuring tactical nukes in the climax, though).
Illusions of Victory. Set entirely on Solaris VII, featuring the machinations of a black sheep of Hasek and Davion families leading inadvertently to the FedCom Civil War. One secondary character is a Clanner (another mentioned by name but never seen in the narrative), otherwise it's all Spheroids. Entertaining, I'd say.
Initiation to War, Wobbies provoke a civil war on recently independent-declared Epsilon Eridani. Okay-ish.
Of course, then there's the entire FedCom Civil War plotline, which features very little in the way of Clan shenanigans.