[Scorpion_062]

I would suggest taking fewer Pathfinders.
They're awesome, and I like the models, but they just don't kill fast enough. Consider taking 1 squad, maybe 2 if you're going for a stealth theme, but 3 squads in a 1000 point game is probably a little excessive.

You don't want bright lances with your guadians. A single shot weapon that desperately needs to hit, isn't something you want to entrust to a guardian due to there low BS. Try taking Scatterlasers or Shuriken Cannons. Also, these guys will benefit majorly from a Warlock. If you plan on footsloging up the middle, take Conceal. If you're planning on sitting them in cover and using the weapon platform, take Embolden.

You might consider taking a CC squad for counter charges. Sit them back and wait for the enemy to charge you guardians, then send in you CC squad to wipe out the enemy. Banshees are good vs. Marines, CM, Necrons, etc. Scorpions are good vs. lighter armored infantry. You can upgrade Harlequin to be good at fighting either one.

About the War Walkers, you should probably split them into 2 squadrons, so that they can't all be hit at once. Consider taking 2 with Shuriken Cannons/Scatter Lasers, and give the loner Bright Lances for some anti-tank firepower.