210 is not bad at all, i paid 199 for mine, same model
Battery life is not great but its the screens (plural) and hifi dac that really do the battery in. You should expect a 0,3a constant discharge
I've never run mine on airplane mode but my advice to you is if you dont have a usb quick charger, youll soon find one incredibly useful. If your open box v10 came with the stock charger, that does quick charge from what ive heard, but mine was bought open box too jmills.
KopaneDePooj as stated by jmills and i you shouldnt be paying too much more than 220usd for a 64gb model, don't know how the market is in the EU though, i know in the USA we don't get dual Sims often as my understanding is they're imported from elsewhere...