I would like some game option that would enable the game to purchase and equip the best available power cell whenever I purchase a ship.

How can the game determine the "best available" power cell?

You might like the loadout manager plugin, which would let you pick what powercell to purchase with each ship: http://www.voupr.com/plugin.php?name=shiploadoutsmanager

Actually i think it would be better if ship purchasing was thought of differently than a la carte item purchasing. I.e. you select a ship and it has an array of checkboxes or dropdowns for addons and have default settings but can also be changed.

And then all a la carte purchases would be added to inventory and not directly to the ship (if a slot is open).

Best in terms of when the cell becomes available.

Free -/-/-/-/-
Light 1/-/-/-/-
Medium 2/-/-/-/-
Heavy 3/-/-/-/-
Fast Charge 4/-/-/4/-
Ultra charge (this cell would override all other cells in this setting)

This would be an opt in option under game settings.

That plugin is way more complicated that what i want.

Depends on what you're doing but it's either Heavy, FC, UC or that cell that has 550cap and 50 regen but with 8 grid if you're flying a two-port energy boat and have credits to burn.

Is there a simplified loadout manager plugin?