I believe the 4300 is still on production. I tested one and it gave identical results to my old 885 so I kept the 885.
I see you have a ST80. How good is it for digiscoping? Isnít chromatic aberration an issue with the short tubes? I just bought an Orion ST80 (Identical to the Celestron) for astronomy, but Iíd be delighted if I could use it for digiscoping.