Well, after long internal discussion, I decided on Tacx as providing the best value Ant+ trainers with deals available at the moment (Genius for £470), but noted their annoying pricing and description policy which has you paying for just about everything Tacx, although the option of going Trainer Roads / Zwift is more appealing. Tacx VR software is unlikely to run on the Atom based netbook I use for the purpose.
Then, to decide on the model. The Vortex Smart is by far the cheapest, but not too different in tech from my Satori, and I'd rather like to improve. The Bushido seemed best value, but again the Genius seemed to be a substantial improvement. However, you still need to buy the Tacx PC connection kit for another >£100 or at least a dongle, then you have to go with 3rd party software. So, I ended up with the Ironman Smart from Rosebikes (god bless the euro rate!) which has both the software and a VR film chucked in to the deal, for around 500 notes (deal appears to have disappeared with the last one in stock, soz)
Now winging its way through DHL tracking system, in Koln right now.