ordering from China.....which Chinese Tube Integrated at 3k?

seeking advice please,

I've become intrigued recently by these relatively low priced 3k-ish tube amps

the bigger seemingly more reputable sellers appear to also offer refunds 

the contenders from I can see are the Willsenton R800i series and a heap of various Line Magnetics (508 ia, 518ia, 608 ia)

I like the balanced inputs on the Willsenton but the overall weight I don't like

my speakers are in the area of 89db sensitivity

can anybody recommend the above models?