We have also got a Britax, we got ours on special offer at Kiddicare including free postage. My parents are borrowing it in their car for the moment but we will have back as soon as our baby has outgrown the travel system car seat. They last up to 4 years and you can check on Britax website to see if it is compatiable with your car. My parents had a Britax about 25 years ago for me when I was younger and really recommended that we bought the same. It is good and sturdy and lasts.
You need to make sure it will fit securely in your car first and foremost. Britax have a list of which cars their models fit on their website. There is a MN review list here but there may well be more recently introduce models missing.
Another vote for Britax - the Renaissance is excellent. Kiddicare is worth checking out as they often have special offers on last season's colours. Do check on the Britax website whether the seat will fit your car though.
i would recommend the maxi cosi priori. just bought my second one today. have had the other for about a year and it is easy to fit, straps adjust easily and don't twist if you know what i mean. it was also rated very good on the safety results somewhere. not sure what the website was but i think it was off a link on mn. sorry to go against the flow!