Personally, for a red dot/reflex sight on a 94, I'd go this route:
http://www.midwestgunworks.com/page/mgwi/prod/winchester-model-94-accessories/2196AI have a Browning 71 with the red dot on the back of the receiver in the peep sight location, it's too close to my eyes for what I want it to do. I'd rather have it further forward.
Here's a rear mount for the Burris Fastfire sight:
Burris Winchester 94 FastFire Red Dot Sight Plate Mount Matte
http://www.natchezss.com/product.cfm?contentID=productDetail&prodID=BU410334Looks like it fits the pre-drilled mounting holes on the top of the 94 receiver.
It would good to your thoughts on it when you are done, I'm thinking of something like this for a newer 94 in 38-55 for deer this Fall.