the Streamer LX is the bolt on version, and it's the cheapest of the range Also, the streamer Jazzman (j-mm pickups), and the Warwick Streamer $$ is bolt on (maple neck instead of the usual ovangkol). The ying yang inlayed Streamer is the Stage II, mucho dineros.
For older Streamers, there is the Streamer Standard, which is the precursor to their Rockbass range, and also the Streamer Pro M, twin-jazz pickups, dual preamp, with bolt-on wenge neck. Very nice imo. Seth Horan's old #1 bass.
Oh yeah, and their LTD 2008 with wooden pickup covers, and very sexy.