I have no experience with the S-125, but I owned the S-150 for several years and thought they were an excellent value. They replaced a pair of Spendor S8e floorstanding speakers. However, I think the driver arrangement is fundamentally flawed and you could do better with a more conventional design. If you happen to be using a pre/pro, I suggest you take a look at active speakers. Regarding stands... I'm using sound anchor adjustable studio stands. They fit the S-150 and my current JBL LSR4328 perfectly.
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Active speakers have several theoretical advantages. M&K made the S-150 in an active version for their professinal division. I appreciate the theoretical advantages, but I really like having fewer boxes in the system -- no multichannel amp. Also, no speaker cables. Lower IMD. Potentially lower total cost.
Quad makes an active speaker. I'm not sure how well it would handle high SPLs for movie watching.
Here's a link to many active speakers: http://www.bhphotovideo.com/c/buy/Studio-Monitors/ci/8617/N/4294550597
I'm using the KRK VXT6 in my office system. I'd probably pick the VXT8 for a home system.
I'm using the JBL LSR4328 plus LSR4312 subwoofer in my home system.