OK - it is extremely unlikely (at this point) that we will get a LM 170, unless Railwaves decide to make one (because the main one that's been made is payware, other people are not allowed to release reskins)
I recently asked nexusdj about the 350s, but he said the project is on hold - unfortunately the other person who could make them (squeak) seems to not be contactable.
Shane
EDIT: Nexusdj's class 321s are a good compromise - they are available in LM, SL (Silverlink - branded and unbranded) and FCC.