Heres a quick list I drew up each for Imperial Guard and Space Marines using the lists in the armageddan rulebook.

Aimed for 2500pts playable army each with cheap money options in mind too, tho that could be changed.

Codex Astartes Marines 2500pts

4 Terminators units
-supreme commander (captain or chaplain)
-425pts

6 Tactical units
-1 whirlwind hunter, librarian
-425pts

6 Tactical units
-1 whirlwind hunter, librarian
-425pts

4 Assasult units
-175pts

4 Land Raiders
-400pts

1 Reaver Titan
-650pts

(yes the titan is a bit much but both the GW and FW reavers are very cool)
Guard list in post below