Locally until we get more boxes for Elves and Uthuk we're running 125 pt games alongside the 200s for Waiqar and Daqan. I have 2 UY army boxes and a command box however I haven't played them enough to know how well each unit performs. Can anyone recommend a good 125 build?

Would you go for some elaborate combos (Warsprinter+Shrieker / Diviner+Reaver) or just keep it super simple?

Ravos the Everhungry [40] 1x1
Insatiable Hunger [3]
Total Unit Cost: 43

Berserkers [27] 2x2
Tempered Steel [3]
Raven Tabards [2]
Total Unit Cost: 32

Berserkers [27] 2x2
Tempered Steel [3]
Raven Tabards [2]
Total Unit Cost: 32

Spined Threshers [18] 1x1
Total Unit Cost: 18

http://tabletopadmiral.com/runewars/uthuk/p122uEMu27u2fp122uEMu27u2fp141uEMu75p151

It's hard to say because I'm not familiar with what other factions will do at 125 points, but I think you could make a Fear Incarnate / Psychosis Siren build work.

Your list looks pretty good, too.