We currently use Bogen 501 heads on our tripods. However, after renting an expensive Sachtler legs & head, I am wanting to upgrade our heads. I realize that in general terms, the more you spend, the better the product. What I am looking for is the best balance between a $2500 head and something better than the 501? Does anyone have any experience with the 516 or 519 from Bogen? Is the difference really worth it. The largest camera I have now is the Sony DSR-250 (full size DVCam). And will likely be adding nothing larger than Panasonic's HVX200.