Inna,
I apologize, but I find it odd that you pose the question as to what people think about SME tables, then seem to answer your own question by pointing out other tables people should preferably consider. Moreover, have you seen the prices for a "highly customized Technics SP10-Mk III", with the power supply properly restored? While I am a big fan of the SP-10 MK III, I purchased an SME 30 Mk II for much less, and a used SME 20 goes for maybe 1/3 the price - further, both of these can be easily serviced without certain parts already having become unobtanium.
The Walker Proscenium is in a completely different ballpark - $60k more than the price of a new, fully tricked out SME 30/12a, and about twenty times(!) the price of a used SME 20/a.