if you ar talking real video i would suggest actual hardware (i.e. video mixer). You will ahve less crashes (i.e. 0) and even if it does fail, a low end mixer reset is switch of switch on and your goign - much quicker than a computer. For a mid range try a videonics product - good value for money just be sure you treat the well as the are not very well cased - they are awesome for permanen installs. I think teya re up to the MX4 we have an MX1, MX Pro and MX3 and they are all still working and awesome for their price. They all have chroma key function.