I spent some time today workin out an appropriate logo for Wessex Biowonders (which could work fine as its own company. I like the WX combination but I'd say my favourites of these are 4, 6 and 7. The main angle I was going for was something that reflected the aesthetics of the 1970s so I did some digging into 60s and 70s-era branding. Company brands like Motorola and Sony have been relatively unchanged since the 1950s while others like Renault adopted an aesthetic of clean parallel tramlines.
I might stick with 7, as it is one of the stronger outcomes. The least convoluted and possibly most echoing the period-appropriate trend of bold lines and clear imagery..