The head custodes himself! Constantin Valdor is the Captain-General of the Adeptus Custodes from Unification throughout the Horus Heresy. He is a stone cold killer in the 30k rules, nearly able to put down a Primarch on his own. I didn't plan on getting this miniature when it first came out, because I thought it looked too "busy", but the more I learned about the Custodes I realized it was perfect. To date, this is probably my favorite miniature I've ever painted, I just love the way it has turned out. Still haven't gotten him on the table for a game yet.
This Shield Captain or Tribunate (if Constantin isn't around) is built specifically for 30k. I gave him a Paragon Spear and a Praesidium shield (the shield limits the spear on the charge, but it is still worth it). The figure is a limited Forge World miniature with the head from a Sagittarum Guard and a plastic Shield. In my few games I've used him in, he has just murdered lots of Imperialis Militia.
Custodian Guard Squad 1
The first squad has all Guardian Spears with one of them having a Adrathic Destructor. I love the Adrathic weapons, even if they get hot! These guys can brutalize most anything they run into, but can struggle in later combat rounds against terminators (in 30k).
The same as squad 1, just with three Custodians.
These Terminators are great! Both in 30k and 40k. Two have Lastrum Storm Bolters and Solarite Power Gauntlets, one has a Athrathic Destructor and Gauntlet and the final one has a Infernus Firepike and Power Talon. The Solarite Power Gauntlet is one of my favorite weapons, it is a power fist that doesn't strike last!
Telemon Heavy Dreadnought
The Telemon is like a mini Knight Titan with a ton of firepower. I have given mine an Arachnus Storm Cannon for tank killing, at range,and then the Caestus Power Fist for punching anything to death. The fist has a plasma projector and then a Spiculus Bolt Launcher on top for masses of infantry. I haven't used it in a game yet, since it is crazy expensive in points.
A dreadnought that I have used, and has done me proud, is the Contemptor-Galatus. This bad boy is all about close combat. His shield makes him very tanky and the sword takes care of anything that it faces. This dreadnought killed 5 Iron Warrior Cataphractii Terminators in a single charge last game, they didn't even get a chance to attack! And his sword has a flame thrower as well, what more can you ask for. It is a heavy choice in 30k.
The Contemptor-Achillus is all about that spear. It has a lascannon equivalent for ranged attack and then is a D weapon in close combat when you charge! It's can have Adrathic Destructors, incinerators or Lastrum Storm Bolters on its arms. The Achillus below is fully magnitized at almost all the arm joints and weapons, I can replace the arms with a power fist and Kheres Pattern Assault cannon for the basic 40k version. I am completing another Achillus now, that is in a more dynamic pose, but not magnetized. It is an elite choice in 30k.
I really like these guys, they have a heavy bolter that fires as an assault weapon with an underslung death ray (Adrathic Destructor). Then on top of that they are still multi-attack, multi-wound Custodes if the enemy gets close.
The real stone cold killers in the 30k list are the Hetaeron Guard. These guys are the the closest to the Emperor, protectors, aids... friends. They have a relationship with the big "E" that even the Primarchs are jealous of. They are also just called the companions. In 30k each of these guys is almost like a Legion Astartes Praetor. They have three wounds three attacks base and can bring all the best weapons. I gave two of mine Paragon Swords and two Solarite Power Gauntlets and all have Praesidium shields. These are conversions of the plastic Custodes with Blood Angel swords and terminator power fists.
These are my newest Custodes. The Venetari have jump wings and only power armor, ugh a 3+ save only. But they are a mobile force with a lot of punch, since they are still Custodes! I finished two with Tarsus Bucklers and archaeotech Kinetic Destroyers and one with a Venatari Lance. However, I am finishing two more, both with lances.