I have an Elna 6600, it is OK, BUT the foot assembly is not as well machined as the old Elnas were. I do not like the way the spool holders work in the 6600 either. It has been designed by someone that knows nothing about sewing!!!!
The spool is held the wrong way so the thread feeds off the top of the spool - and does lead to bunchy tangles -instead of unrolling the normal way. Althougth they added an upright spool holder, it is still clumsy.
I have a little old Elna Air Electronic Stella, that is quite battered, but outsews ALL of the other sewing machines I have ever tried, because of the design of the foot and teeth although it only sewes a straight and zig-zag stitch!
I would suggest you spend some time trying out others, I say this regretfully, too!