When I worked for an access television station I used a Panasonic WJ-MX50 mixer that had a digital frame sync and accepted Y/C inputs eliminating the need for genlock. Panasonic has moved on and has a new model but the MX50 is available used from lots of places and is a pretty good value, although still to this day a little pricy if you're not going to use it frequently. Used these go for in the vicinity of $1200.
You might be looking for something like this. Very prosumer, but based on the limited information you provided, this may be the direction that you are headed.
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