Which scanner is the best choice?

[PsychoTechFreak]

Some thoughts on the 5 available scanners, I begin with the cheapest to research, end with the most expensive Tachyon sensors:

1) Hyper Optics (255 K of RP):
-BTW you get some tech areas: Combat Support, Torpedo Weapons, PDF Weapons, Weapon Overloading Weapons, Ship Capture, Advanced Military Science
-and some Facilities: Ship + Fleet Training Facilities

2) Psychic Receptors (Racial Trait needed, 350 K of RP):
-Facilities: Psychic Ship/Fleet Training Facilities
-leads to Psychic Scanner Facility (any ship within system can be scanned in detail)

3) Temporal Sensors (Racial Trait needed, 350 K of RP):
-Facilities: Events Predictor Fac.(System Combat Bonus), Temp. Vacation Service (Happiness)
-leads to Temp. Spaceyard Fac.

4) Gravitic Sensors (450K of RP):
- Tech Areas: Stellar Manipulation, Tractor/Repulser Weapons, Stellar Harnessing, Gravitational Weapons, Null-Space Weapons

5) Tachyon Sensors (1100 K of RP):
-Tech Areas: Shields, Sensors, Energy Stream Weapons, Energy Pulse Weapons, Combat Sensors (attack bonus)

I think Tachyon Sensors are WAY too expensive to research, ok you need some of the tech areas of the basic research (e.g. shields), but the 750 K of Research Points at the end just to get Tachyon Sensor III is too much.

Any thoughts ?

Does anyone use Long Range Scanners to detect enemy ships in detail ?