Well, I think a returning player rather than a brand-new one: Art Crime Productions.

ACP Games produce a small but beautifully realised range of sci-fi figures that they say are "nominally based on 15mm", with the final size dependent on the designs.

So far they have some what they call Characters, mostly infantry of a couple of different types; some rather nice looking Vehicles; and the start of a Makat Empire range that looks definitely worth investigating.

Here's one of their tanks: the Spartan: