Its hard torecommendto someone I think, your kids are so precious its a personal decision. My wife & I have reasonable priced seats from good old Argos, obviously passing all the safety requirements.
Some people dont feel comfortable/safe, unless the seat costs hundreds of pounds, & looks can be important (Im stuck with a sodding pink seat in the Vectra :cry: )
As Johnny said, Britax are a top brand, and boy woule I love a Recaro like pink princess.
Good luck with the search & sorry that this doesn`t offer ay real solutions.