Ok as a Skitarii player from the day they first came out.
1. Calivers melt things but are almost definitely going to Get Hot due too the 3 shots.
2. An arc rifle is a good bet for taking out the light Armour you'll see in kill team. (its rapid fire haywire) and has decent S and
AP for toasting some infantry on the side.
3. I wouldn't take an arcubus at this points level. Its good but 25pts probably isn't worth it.
4. Consider doing 1 squad of rangers and 1 of vanguard (5 and 5) take an arc and caliver in the van and no spec weps in rangers.
Check out this page for a rundown on both those units:
https://1d4chan.org/wiki/Warhammer_40,000/Tactics/Skitarii_(7E)
Ask me anthing about this its probably the one army I feel qualified to talk about.
Automatically Appended Next Post: OH AND:
Alphas can take a 4+ invun! arc pistols, powerswords and a bunch of other toys! (fill up your points cap with these once you have your men and 2 spec weps)
Its all on that page I linked: (pretty good website (has a page on every faction) but its got some freaky stuff if you look too deep)
Automatically Appended Next Post: I'll do a more in depth breakdown of my suggestions (and my personal killteam list for my skitarii) later. (pressed for time and on mobile right now.