Budget... let's say $5,000 for a usable system. Presently I shoot nikon and use a camera from their 1 system for slow motion, but due to the somewhat unpredictable movement and length of time I would desire to record, I find 2-4 second caps and then waiting for a buffer to clear to be limiting. Low light is not necessarily required, but preferable. Outdoors midday in fair weather will be the primary working environment.