I don't have any experience with Anvile figs, but check out the denizen Sci-Fi figs. They are very true-scale 27mm (sole to eyeline), so they might be too small, but they are really finely done figs. Extremely affordable too. I like them alot and have made the Venturan and Khiff one of my Sci-Fi factions.
Here's how the Ventauran and Khiff stack up against Grenadier/EM4 Future warrior and an Urban Mammoth Urban War Gladiator.
With GZG and GW (courtesy of Saxon Dog's blog)
Except for two officer figures with exposed heads/faces the ostensibly alien Ventaurans make fine humans. There's also a "Federation" faction of armored humans the same size and a "Mid-Tech" ("not" Aliens Colonial Marines) faction as well.
http://www.denizenminiatures.co.ukThey are exceptionally well detailed miniatures, even more impressive when one considers that the sculpts are over 25 years old!