Been tinkering with ATMs lately and run into the ATM/LBX combo and I am a big fan. What mechs can really utilize this combo to maximize effectiveness?
Anything with a couple of ballistic points and at least 2 missile hardpoints will be OK. But these are 2 weapon systems that don't have a lot of synergy. If you're so inclined, something like a Marauder IIC Scorch, Mad Cat II -2 or a couple of different Highlander IICs are probably where you'll find you have enough tonnage available to run LBX and sufficient volume of ATMs.
What kind of speed and LBX size do you prefer? _ _ _ ECM available via Blood Asp, Sun Spider, or MAD IIC - D (limited to LBX10s and ATM9s or LBX5s with ATM12s).
Even slower. _ You can do 2xLBX10 and 4xATM12 for a bit more midrange firepower. Or there are some fun options for gauss. http://mechspecs.com/threads/mcii-2-das-sound-machine-1xcgr-4xcatm12-xl325.15258/
