that's the problem you run in to with most cases. i agree... it kind of sucks having to just use the cord with the case on, but it's worth it if you want to protect your iphone.
I have a iPod Touch, which is 0.8mm wider than the iPhone, according to apples site. I pick up a Universal Ipod Dock from Circuit City. I'm able to use my Touch /w the Griffin iClear on it, while in the dock. The dock comes with 6 white plastic adapters for all sorts of ipod models. If you don't put a adapter in it, the area is wide enough for the iclear!
I have the iclear on my iPhone and it fits in my universal dock. I have the older one as well and when I dock the phone it say this accessory was not made for iPhone but you just hit ok and it syncs just fine.