Cheers,They're all quality bikes. Price has nothing to do with quality. We've had very few people on this forum that weren't happy with the bike that they bought, and those that weren't cover the complete price range.
If you want a high specification bike with a throttle, look at the Oxygen E-mate MTB:
http://www.e-bikesdirect.co.uk/Item/Brands/Oxygen_Electric_Bikes/Oxygen_Emate_MTB_13AH.aspx