nice to hear recommendation for s19k pro 120T @ 2760w as it is one of the miners that I liked on ebay.
by the way, are you hesitant to order from china or they should be fine? because the best offers that I see for 'brand new' miners are from hongkong/shenzen.
also the link that you've sent for the 270TH miner has some 'trusted vendors' at the bottom, should I order from them since I don't see it on ebay ( x-on mining, apexto, crypto tech, yesmining... )
if you live in usa buy from altair
better get a heater mode of s19k pro
https://altairtech.io/product/bitchimney/https://altairtech.io/product-category/miners/bitmain/what voltage system you have ? 3 phase? 1 phase?
temperature viariation in your city?
electricity costs?