200GHps Avalon for 4.8BTC = 0.024BTC/GHps
275GHps Saturn for 7BTC = ~0.0255BTC/GHps

When comparing the power consumption, the Saturn is way more efficient.

PS! ~200GHps BTminers (Avalon gen2 chips) are currently sold for 2.2BTC.
https://bitcointalk.org/index.php?topic=379819.0