Looking around the eurozone i have found several vamo and lavatube kits (body+charger+2 batteries+various other trinklets) and evic's for sale for around €65-70 shipped which just so happens to be my price range. (found some cheaper from the US and china but those take long to ship and if you add customs+vat they wont be so cheap anymore) Looking over some reviews allowed me to discard lavatube v4 (which is supposedly made by a different company than the v2 and is slightly inferior in both power delivery and functionality while costing more) but between the other 3 it is not so clear.
I know that the evic comes a bit short in power delivery (struggling to reach 11w) but i like the fact that you can charge it with USB since im always near my desktop or laptop. The statistics software stuff i dont really care about.
The vamo and lavatube v2 have extremely similar power delivery with similar techniques even and while they are slightly superior to the evic in this regard they lack the usb and have to be charged manually.
So basically i dont know which one to get, i'm unaware of any other characteristics like which one feels best in your hand or how durable they are. Another important factor would be how difficult it is to open up the head piece to fix stuff in case they break since im handy with a soldering iron.