Okeys... I actually managed to get a whole lot done today, so here's my opinion on the first mechs of phase two.
Panther - I just couldn't find a reliable way to farm KMDDs in this one. My Panthers have only very few skill points so far (3-4) mind you, but probably the best loadout is 2 SNPPC and focus on one target. It took me a lot of matches to get the KMDD requirement.
Arctic Cheetah - Took me 3 matches to finish it. The third to get all the assists needed. 6 MGs and 2 HML work decent.
Blackjack - Wasn't too hard to get those finished. The trial is really good for that - if you have that variant add on LFF and another JJ, really adds some mobility. Arrow works decent as well (6 LMG 2 ERML 1 LPL LFE235) or the -2 with 4 SSRM4 if you wanna hunt those pesky lights.
Stormcrow - Again a very easy challenge. If you wanna go ham, just go full on streakcrow. Should get this done in a match or two, depending on the assists. Didn't actually get to test the trial version (which is what I have on my prime).
Dragon - Difficult as expected, but easier as the Panther. The Flame (LB-10X 4 MPL LFE300) and the -5N with triple UAC/2 work alright.
Will comment on the rest tomorrow.
If someone has other build ideas or needs some, just keep em coming.