I believe all electric bikes look electric because the battery or motor (hub or crank) gives it away in most cases. With this in mind, the best electric bike is the Kalkhoff Pro Connect S Disk, but models from 2011 onwards.
It has the best components for the money (£1500 used - £2500 new); XT Deore throughout, comes with lights, rack, stand, mudguards (which some bike shops will charge extra, for other brands) so good for commuting out of the shop! It's also unlimited (+28mph before it cuts out), fast and powerful and looks like a bike and not a moped! I often research other electric bikes in the UK and abroad (Europe) and I always come back to the Kalkhoff. There was only one other bike that floated my boat, but it cost 5K, simply because it had a Rolhoff hub instead of Shimano gears. Rolhoff internal gear hubs cost £1500 and are unbeatable for reliability and maintenance, hence the price!