I bought my Juki 98Q WITH a GMQ frame a few months ago for 2200. If you look, you can find the Juki new for about $800. I would have no problem buying a used one, however, because I think they are hard to kill.
My Juki has a thread cutter, which I love, When you cut the thread, it automatically raises the needle. It is a straight stitch machine however. for Zig-zag I have to go to the oldie.
For me, less to break down or wear out is a great thing. It's like an updated version of a treadle- oil her and she will run forever.