Brian Stansfield

8x8 and 12x12 are my go to's ... 20x20 is WAY too big for anything I shoot usually and needs a lot of support on exterior shoots. Anything smaller than 8x8 I use a california sun bounce, 4x6 and 2x3.

I'm shooting with the C300 with Zeiss Primes using a Vokas shoulder mount and possibly an Easyrig...

Easyrig will certainly help. Since you're shooting with the C300... canon makes some great image stabilized glass... the 70-200 2.8L II IS, is a work of art (pretty cheap to rent as well). You can literally go handheld (static) at 200mm. Gives you a good range to play with and the image stabilization will certainly knock down a lot of the unwanted jitters... that and warp stabilizer.

http://www.filmtools.com/filmtools-4-leg-suction-cup-camera-mount.html

I've used this Film Tools car mount before and it's pretty smooth... granted, it's no gyro/stedicam, but with a smoother road it works great. Plus you can suction mount outside the car in virtually any angle with the ball head. Really depends on the composition you're looking to achieve.

http://www.bhphotovideo.com/c/product/586421-REG/Litepanels_RM_F_RM_F_Ringlite_Mini_System.html

This is a battery powered 5600k led ring light... this hits all your specs if price/rental availability isn't an issue. But I agree with above, a 2k gennie with a joker 400/800 will certainly get what you want in the par configuration... more light is almost always better than less, in my experience.

I used this doing something similar but had the ring light on camera, 2x400w UV blacklights, 2xfogmachines , 1x2000w putt putt mounted on a golf cart... we were shooting a 5k race at night with glow in the dark paint in slow motion with the red epic at 240fps close to wide open on a bunch of Canon L primes. It worked out okay, but as previously suggested in this threat, a joker bug 400/800 would have been a better option (electric ballast). Night + Super Slow Mo + Golf Cart + blacklights = nightmare. Anyway, good luck!

I can't speak to the exact meters you've listed, however, I can say I've been extremely pleased with the Sekonic L-758cine .... is it pricey? Yes. But, the logic behind it is buy this bad boy once and you have an all in one calibrated do-no-wrong meter that will work for decades. It's an investment, and one well worth it, in my opinion.

http://www.bhphotovideo.com/c/product/476493-REG/Sekonic_401_760_L_758C_Cine_Light_Meter.html