I got the SoloFx and DLO Jam Jacket, haven't decided which to keep. The solo was 25$ so if I don't like it at all, it's definitely going back. The DLO was $11 thanks to Best Buy being complete retards about pricing, it's a cool color (blue, they come in black, white, and pink also), got great reviews, and I got 3 screen protectors and a case (and the screen protectors are apparently awesome, but I rock it naked now because the screen is protected by the case going around the bezel and giving it some height). I like silicon simply because it offers some protection to falls. Also, they don't get scratched. Both have non-silicon feels to them, so they won't catch on your pocket or collect lint as much as regular silicons. I have a Malware silicon on my 2G now and LOVE it, as it has saved my phone numerous times, is a great feeling silicon (rarely dirty, and i've had both the black and blue versions), and doesn't stretch. So I'm all for silicon. Switcheasy colors is another great silicon case I've heard.
As far as hard cases, Speck Candyshell seems to be the most raved about/best protection/sexiest. Incase Slider has a lot of rave to it, but apparently scratches the heck out of the phone.