The Perseus architecture is several years old, but being realistic, it still is one of the best SDRs available in the sub-$1000 price range. :)
Is there a particular feature or whatever not offered by the Perseus you are wanting? It might help narrow down a replacement, assuming you really want one.
BTW, much of the recent developments in consumer-market SDRs have been towards more affordable solutions, such as the Airspy HF, SDRplay RSPdx, RX888, etc.