I have a lefty SAN 450, bought around 1996. Any Artist Series Samick is good. I replaced the pickups with a pair of Australian Mick Brierley humbuckers custom wound for a mellow jazz blues sound. If someone were kind enough to give me a Gibson 335 I would love to have one, but my Samick is a pretty good substitute. It is a great guitar to play, and the Brierleys are very toneful and articulate, with nice chord tones as well as smooth lead tones.
My SAN 450 has a pressed laminate mahogany body, mahogany neck and rosewood fingerboard. I am not sure but I think that a SAN 650 is a 335 copy with a carved top. The 650s I have heard to be very good copies of the original.
The Artist Series Samicks I believe went out of production around 2000 or so, before the introduction of the Greg Bennett series. Any SAN 450 available is well worth a look.