I recently purchased some new shorts and also had a huge dilema about which type to get.

In the end I went for Pearl Izumi pair - the fit is very good and the chamoix is good quality but without being too bulky. (I hate that feeling as if you're walking around wearing a nappy!)

They also have quite a short leg -which is ideal for those hot summer rides so any sun tan mark is quite high up the leg.

I suggest trying as many pairs on as you can, as a lot of it's down to personal preference. Sometimes I've tried on top of the range, expensive makes only to prefer the feel and fit of much cheaper ones.

Good luck