Congratulations!!
The Sophia are very nice too. I received a pair with my amplifier by mistake instead of the EML so I used them for about a week. They soundded very good. I would be happy with them but I paid in advanced for the EML so sent them back and waited for my EML.
Th CV181Z were my upgraded driver tubes from jack in my order. They are very nice and dynamic. Less warmer than the Tungsol 6SN7GT Black Glass/Round Plates or the RCA smoke glass. I think latter you should talk to Will (PM I sent you) about the Sylvania Brown Base/Chrome tops 6SN7WGT. I thik you will like those. Also the found that the Ken-Rad V231 Black Glass/Stagger Plates are great with open headphones like the HD800 becuase they are bass monsters without missing much in the midrange and high frequencies..
Any specific reason why to go with the Shuguang treasure 300B?
If you can not go all the way to the EML 300B Mesh I woul probably go then to the Sophia Princess 300B Mesh. the later you can upgrade the rectifier and 300B to EML. Just my opinion.
http://www.sophiaelectric.com/