Sadly nobody makes Sins of the solar empire models, which would be awesome if they did.
So I settled in something called Firestorm Armada, it got about a dozen races/factions, In ensense humanity has devided into two factions, that have their own alliances with alliens.
You got all the standard sci fi stuff, reptile aliens, arachnid aliens, some water living aliens ect.
Each got thier own style of ships, you got all the standard ship types, frigates, cruisers, capitals ect. The ships are from 4cm to 18cm. Sadly there are no fighters, so I have to make my own tiny fighters.
The first two races I bought was Terrains, with are not suprisingly humans, one of the human factions, the other race is Aquan, which is the water people thingies.
I did the aquan in aquamraine and tourqose,
The terrains got a blue green/grey theme, the big battleships is 18cm long and takes along time to paint, lots of small detials.