How about this:
[size=150]Bad Karma[/size]
A lone vessel has been seen prowling near the trade lanes that feed our empire/commonwealth/whatever. A squadron of ships are sent to investigate--a couple of battlecruisers and other small fry. However, when they see the craft, they realise Intelligence has screwed up again--the vessel, far from being a lone cruiser, is a space control ship, a vessel that combines the functions of both dreadnought and fleet carrier into a deadly predator. And your squadron has just sailed straight into the guns of one. Talk about bad karma.
Scenario:
Two players both get 2500 points. However, one player (the raider) MUST spend all their points on one vessel and accompanying fighters. No escorts other than fighters are allowed. Also, the vessel must have a powerful primary battery to justify its position in the line of battle. So it must either have:
a) a spinal mount
b) a weapon with a range longer than 12
c) a weapon with a special modifier over 1.5 (i.e., re-rolls penetration, halves shields, extra crew casualties etc)
d) enough drones for three full salvoes (i.e., at least 30 drones)
The other player may have two vessels with a cost exceeding 500 points but not exceeding 1000 points.
The fight can take place in an open map or a map with a large number of asteroids.