Hardwiring Summary by Slot (Gunnery)
Out of slots 6, 8, and 10 you probably have 1 obvious choice you care about, i.e. your favorite racial turret in your favorite size.

6: +dam for racial small turret, else use a utility hardwire.
7: +tracking, -cap, or +falloff.
8: +dam for racial medium turret, else use a utility hardwire.
9: +dam, +rof, or +optimal.
10: +dam for racial large turret, else save CPU.

Summary by Slot (Missiles)
6: +dam for large launchers, else use a utility hardwire.
7: +dam for medium launchers, else range.
8: -explosion radius for guided, else +vel for defenders (but a utility hardwire is probably preferable over that)
9: +dam for small launchers, else +explosion velocity.
10: +rof unless you really love FoF.



From: http://wiki.eveonline.com/en/wiki/Skill_Hardwiring