I always keep an eye out for sculpts that could be used to represent things from the Mass Effect universe, or could be easily converted to do so. Thouht I'd post some of them here in case others are interested.
First a couple that aren't available yet, from Mantics Dreadball:
The not-quite Salarian Judwan, there will be a team of these
The not-quite Geth Wyn Greth'zki MVP
I'm rather hoping Mantic will go the whole hog and give us a not-quite Asari team in the future, plus the female Corporation team may be suitable with just some headswaps.
T-PEA Troopers from Antenocitis workshop look like they could make foor Asari/Eclipse mercenaries with a little modification (more if bareheaded Asari are desired)