Something I posted on my platoon leader game:
Overall I've been using these rules:
Gruntz 15, good fast play rules, lots of options for unit design and suitable for more casual players
Victory Decision Future Combat, upgrade chrome a bit, easy to build forces because they are basic archetypes
Platoon Leader, lots of chrome, very involved design system to match that chrome, gameplay very reminiscent of StarGrunt II
I feel that having all 3 covers all the spectrum of players I might face

... nevertheless... of course if a new set of rules I'll get them quickly.. because... I'm a wargamer, we accumulate lead and rules !!
( all those rules are in wargamevault )
cheers
Francisco