Old siren (1200 ru, huge range)
Same radius (1200 ru, low range)
Same price (3000 ru, high range)
Expensive upgrades (1200 ru, high range)
So so (2000 ru, mid range)
Variable 1 (2500 ru, 75% of map)
Variable 2 (1500 ru, 60% of map)
Don't change