u/Apprehensive-Whole24

Hello guys! This is my Silverwolf999 and i want to invest on it without pulling Sparxie (beacuse i don't like her very much). Is there any point where i should stop at investment on a single unit, or there is some supports that i can slot in (like tribbie in Remembrance)?
Thanks for all the answers and if this post was already asked you can link me the post where the discussion where already made!