Advice for my Ultramarines list?

As title states, I've only been at this for 3 months, and have over 1500 points painted, with many more based and ready for detail. But where do I go from here? Gladius Task Force and Ironstorm Spearhead interest me the most, but I'm open to all.

Characters/Heroes:

Marneus Calgar w/ Victrix Honour Guard

Roboute Guilliman

Apoth. Biologis

Cpt. (Heavy Bolt Pistol, Master Power Weapon, Relic Shield)

Cpt. In Term Armour

Librarian in Term Armour

Lieutenant (Neo Volkite, Power Sword/Storm Shield)

Lieutenant with Combi Weapon

Techmarine

Infantry:

Aggressors x6 with Bolters/Frags

Inceptors x3 with Bolters

Infernus x10

Infiltrator x10 (Helix Gauntlet and Comms Array)

Sternguard Veterans x5 (Leviathan)

Terminators x5 (Leviathan)

Vehicles:

Ballistus Dread

Land Raider Redeemer/Crusader - magnetized for either variant

Redemptor Dread

Storm Speeder Thunderstrike - magnetized for other variants as well.

All of this is around 2800-2900 points already, I want Jump Pack Intercessors, but am flexible for everything else, a Gladiator Lancer or Repulsor Executioner may be an obvious answer as well, but I could be wrong. Love to hear your feedback!