Unfortunately....
I think you will be very lucky to find a proper Nokia compatable car kit below £150 + fitting, if you want proper handsfree, charging, external antenna and cradle.
That's what I paid for mine trade - but fitted it myself - fairly simple job which takes about 1 -2 hrs depending on how easy it is to remove and replace the car's trim.
Personally wouldn't bother with these cheap universal kits as sound quality is poor, there is a serious risk of interferance with the cars electronics and you get no external antenna = poor signal strength and increased RF levels within the car.
As usual yopu get what you pay for - but don't pay over the top...