I would second the Jenner F reccomendation, the two high end lights would both have a very good speed not to mention the power to pretty much shred other lights, it would also let us help out our bigger lance mates if we hit on some problems.
If your set on the Locost, er "trashcan with guns", I would suggest the E, 2 medim Lasers, 2 small lasers, although I wouldn't suggest the mech at all since to shoot with those, it needs to be in range of other mechs, and the thing does not have th armor god gave a turtle.