Advice on Hardware Encoders for Adobe Media Server

With a recently acquired AMS 5 Professional we have had good results encoding video to it using a Teradek Vidiu hardware box.

The only limitation encountered with this Vidiu device is that it does not provide multiple bit rates out of it. As a result we need to select the lowest common denominator that we are confident our viewers will be able to consume.

Is anyone using a similar form factor product for encoding that provides for multiple bit rates? I'm hoping to stay within $2000 to $3000 price range.

For portability reasons not interested in the Flash Media Encoder right now.

Thanks.