I don't know how fast you are wanting to finish your list or spend more money, but it's less than a month until the
BA codex is released. Until then there's not much point buying all the stuff until we see if we get anything viable. So just keep honing your paint skills and set a theme and standard for yourself.
8th edition is mostly a shooty game and unfortunately I'm quite pessimistic on the
BA codex release changing that much. For casual and friendly games that isn't much of an issue.
Here's some random thoughts for you, others can add more:
What kinda play style you like, aggressive or passive or mixed?
Competitive marine lists usually have a heavy support section accompanied with a captain and a lieutenant. The there's couple screening units denying deepstrike that enemy can't drop anything dangerous near your heavy section. Then there's some units that grab objectives and try to pick enemy threats via fast movement or deepstrike.
For these elements, that scout squad is fine (dunno about
ML on the scouts though). Stormraven is a nice gun platform and only viable mean to transport your
cc dread in close combat. From the same kit as the dc dread you can build a librarian dread which for couple times I've used it in the 8th been nice. It's a character so it can't be targeted by the enemy unless it's the closest model visible. Also it can cast 5++
inv. save. Index version of the
DC is
imho too expensive, so I'd wait the codex and see if inferno pistols get a nice point reduction etc. before I would make tons of them. Boltguns and chainswords are a good combo for your ablative
DC models, rapid fire your boltguns before assaulting. Sang priest is also a nice buff for
DC, S5 wounds
MEQ on 3+.
All your above
HQ's have their place, but maybe not take all named
HQ's, they cost so much more than regulars, but do what you want
This is getting to a novel lenght so..
Tactical squad with a heavy flamer is fluffy, but the weapon is quite expensive for what it does. plasma, combi-plasma isn't that fluffy, but potentiality to diminish 2 wound models is always nice.
Razorback, stormraven (magnetizing isn't that hard) are good transports.
Scouts have their places, I run 2x 5man with boltguns and a storm bolter for screens and 1x 5man sniper cloak squad, never seem to find points for
ML dude).
I'll stop here. Buy minimum amount models, paint stuff before get new ones until you get the codex.
Nice to see new
BA players, welcome.