[Suicide Junkie]

Me:
10-15 Battlecruiser support ships (minesweeper/repair/etc)
~20 Large Transport Troopships.
200 Dreadnought warships.
1 TroopCarrier Battlemoon.

Enemy:
1 Huge Planet
20 Billion pop (Wierd but true with standard planetsizes)
Religious Talisman Tech
GOBS of Huge weapons platforms.

Result:
All Warships Lost
All Troop Transports lost.
Heavy damage to Battlemoon's organic armor.
70,000 (est) troops lost in space.
30,000 (est) troops landed on planet.
~20 turns later the planet was captured.