I'd like to go with Skaven but I think the lack of players at 105 with a RO may make it a bit of a struggle. I'd probably go with:
4 x GR, 2 x SV, 1 x RO, 4 x LM, 3 x RR
Another option might be:
4 x GR, 2 x SV, 1 x RO, 1 x TH, 4 x LM, 2 x RR
and get LEADER as the first skill upgrade. In fact, I like this option better now I re-read the rules and found you give the skills before each game

Any thoughts on these builds and builds for other races at TV105?