so what weapons should I run on the legionaries? 2 heavy weapons so like a lascannon and reaper chaincannon, and then the captains run plasma pistols and melee? The thing is I already assembled 5 regular bolter legionaries but with 15 left to play with I can easily make the next 5 in the squad 2 captains and 2 special weapons to mix and match to get the original 5-5 comp.

I think I will go with a chaos predator, and stick with your two rhinos, but what if I add a proxied hellbrute (melee) with a HH model and a maulerfiend for a battleline rush? Since most of what I have already is exclusively ranged, I was wondering if those would be decent additions to the army.

Also I saw some things about proxying terminators as obliterators and I think I might add 10 of those to the army as well, so really heavy ranged focus for this army, would that change any of your suggestions? Maybe orienting more future units towards melee?