Which brand Stabilizer should i buy?

Looking to get a 6000 or 7000 watt relay stabilizer, need to install it on a phase that usually hovers around 180-190 volts. Only option i know of is Stac, any suggestions would be greatly appreciated.

Thanks.

Stabic

Mohsin Younus Electronics

021-32768674

021-32723340

Near Regal chowk saddar

http://www.mye.com.pk/index.html