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This is a list I've been tinkering with for quite some time and have been posting various versions and I keep changing over my aesthetic vision of it.

I feel I'm down to 3 versions that I'd be happy with the look of that'd play well.

1.
Librarian, mastery level 2, terminator armour, storm bolter, auspex 125
Sternguard squad, 2 combiplas, 2 combimelta, drop pod 195
Tactical squad, meltagun, multimelta 5 additional marines, drop pod 195
Tactical squad, plasma gun, lascannon 5 additional marines, rhino 210
Tri las predator 140
Tri las predator 140

2.
Master of the Forge, auspex 95
Sternguard squad, 2 combiplas, rhino 175
Tactical squad, combiplas, plasma gun, 5 additional marines, rhino 200
Tactical squad, combiplas, plasma gun rhino 130
Rifleman dreadnought 120
Tri las predator 140
Tri las predator 140

3.
Master of the forge 90
Tactical squad, combiplas, plasma gun, rhino 130
Tactical squad, combiplas, plasma gun, rhino 130
Tactical squad, combiplas, plasma gun, rhino 130
Tri las predator 140
Tri las predator 140
Rifleman dreadnought 120
Rifleman dreadnought 120

1500pts (from TabletopTactics)

Master of the Forge 90
Tactical squad, plasma gun, assault cannon razorback 160
Tactical squad, plasma gun, assault cannon razorback 160
Tactical squad, plasma gun, assault cannon razorback 160
Tactical squad, plasma gun, assault cannon razorback 160
Devastator centurion squad, grav cannons and amps 250
Tri las predator 140
Tri las predator 140
Rifleman dreadnought 120
Rifleman dreadnought 120

OR
Master of the Forge 90
Tactical squad, flamer, assault cannon razorback 150
Tactical squad, plasma gun, assault cannon razorback 160
Tactical squad, plasma gun, assault cannon razorback 160
Tactical squad, plasma gun, assault cannon razorback 160
Tri las predator 140
Tri las predator 140
Tri las predator 140
Rifleman dreadnought 120
Rifleman dreadnought 120
Rifleman dreadnought 120

Feedback would be muchly appreciated!

You don't seem to have much in the way of anti-horde; adding a flamer or two (even a combi) somewhere in there wouldn't hurt-can't remember if this comes with master of the forge.

Also, the libby in your first list seems a bit....out of place.

I like list 3 the most. Good scoring, nice AT, and the Riflenaughts can do a lot,

Glad to hear, I think I'm going to go for 3.

I've been thinking about adding in a deep striking element to the list. I've been toying with some Militarum Tempestus scions. For 1500 I could swap out the Grav Cents for:

Command squad, 4 plasma guns 145
Scion squad, 2 plasma guns 100

I could use them to go up to 1850.

Also on the cards are Inquisition allies, primarily for bodies, anti psyker and prescience.

Captain, artifice armour, auspex, power sword 130
Tactical squad, plasma gun, rhino 120
Tactical squad, plasma gun, rhino 120
Tactical squad, flamer, rhino 110
Tri las predator 140
Tri las predator 140
Rifleman dreadnought 120
Rifleman dreadnought 120

Captain, artificer armour, relic blade, auspex 140
Tactical squad, flamer, rhino 110
Tactical squad, flamer, rhino 110
Tactical squad, plasma gun, rhino 120
Tactical squad, plasma gun, rhino 120
Tactical squad, plasma gun, rhino 120
Tri las predator 140
Tri las predator 140
Tri las predator 140
Rifleman dreadnought, 120
Rifleman dreadnought 120
Rifleman dreadnought 120