I like the new MI mount. Haven't seen any user reviews yet since it so new but it does look good.
http://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_id=433
Otherwise there are the old stand-bys such as the
BP-02,
KV-04, or
Molot mount.
The NPZ mount is very nice but pricey:
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=258175123