Name: Attack meteor (unless someone comes up with a name that doesn't suck)
Propulsion: Ion+teleporter
Extras: none
A largish meteor that has a ion drive added to the back and has a teleporter, before a battle it accelerates to as fast as possible in a area cleared of debris, then when it reaches the end it just warps to the start of the area and continues building up speed. As soon as a battle starts it warps close to one of there ships (kepping the insane speed it's built up), and rams them doing a ton of damage, and since it's moving so fast, it would be impossible to dodge and hard to destroy.
Costs: really cheap, just put some drives on meteors, the ion drive wouldn't even have to be really good, the meteor could build up speed over a few years if nessasary.
EDIT:Name: Colonizer Mark 2
Propulsion:teleporter
Extras: Jethro probes
Cloaking
Pretty simple just have it teleport around and shoot jethro probes at planets capable of sustaining life, and have the probes take over the planet.
Costs: really cheap, just a little bit of jethro on the probes and not even a ion drive on the ship, build alot of them and have them explore the solar system and colonize wherever possible
Also, some questions on the drive, does it have a charge up time? high energy cost? high building cost?
And on a slightly silly note, NO FLUFFY PINK UNICORNS
INVISIBLE PURPLE UNICORN VS FLYING SPAGHETTI MONSTER INSTEAD