Mine also hated his infant carseat. It had very poor "breathability" and whenever I took him out he's be covered in sweat. He would arch his back and scream every time I stuck him in and also cry during the drive, especially at stoplights. I got the panda mirror, that you stick on the seat in front of him, for him to see himself and just to have a view in general. That did seem to help a bit, but half the time he'd kick at it until he'd move it so he couldn't see out of it anymore. He also seemed to like it a bit when I rolled down all the windows and opened the sunroof. Maybe it made him feel less trapped. Course that doesn't help if it's cold where you live.
We finally moved him into the foward facing seat at about 11 months and it's been so nice. No more crying! So, if it's really bad and stressing him and you out, maybe you should get him into a foward facing seat as soon as possible. I know it's safer to be in a rear facing seat, but it's also safer to drive without a screaming baby. My girlfriend is a mom of 4 and she moved her daughter into the foward facing at three months. I think she only used an infant, rear-facing at all because of the convenience of carrying the sleeping baby around in it.
I went with the Ricaro Signo Convertible Carseat. It's in the top of it's class for safety and fits babies as small as 5 pounds. Ricaro makes stuff for race car driving and is the most popular brand in Europe where the speed limit is faster. So it makes sense that they score so high. It's like a throne and my baby no longer hates car rides!
Here's a link: http://www.amazon.com/Recaro-Signo-Convertible-Seat-Sand/...