We've had one of the Kenwood ones for quite a few years, but then we don't use it lots mainly for whizzing soups. The bits that came with it are replicated with other gadgets we already have, although the whisk was handy but it soon broke.
So how much use will it get, do you need the extra bits and if its gonna get heavy use check the motor wattage.
This looks like our old one, but someone says it actually has a less powerful motor.
Amazon.co.uk: Kenwood HB655 3 in 1 Wizzard System 400W Hand Blender, 2 speed, whisk, chopping bowl: Amazon.co.uk: