Dunno why, just had a random thought.
Librarian w/ Null Zone, Avenger
2x 10 Sternguard, 2 missile launchers, 3 combi-meltas, 2 combi-flamers, Rhino
2x 10 Tacticals, multi-melta, meltagun, combi-melta, Rhino
2x Land Speeder w/ multi-melta, heavy flamer
2x 10 Devastators, 4 missile launchers, Rhino
Total - 1850
So, that's 30 marines sitting back with 12 missiles while 30 more drive up with multi-melta/melta+combi/combis and a Libby in support. Also Speeders. All units combat squad, Tacticals jack the Devs' Rhinos while the combi-filled Sternguard units take theirs. Very MSU. All it needs is some playtesting and a cute name.