I like the seidio case more then the agent 18. I cant stand the tree on the back on the agent 18.
http://store.everythingicafe.com/con...es/4-123--3002
Also, I had the case leech is talking about and it is very nice, it was just a little to bulky for me. Plus, with the Casemate, the top of the case (the opening) where you slide the phone in and out of got worn out quickly and started to feel a little loose.
I agree with Leech though, contrary to what Macman said, I would highly recommend modding. Ive had my phone modded since day 1 when I was on 1.0.2 firmware and I have never had a problem with it. And if worse comes to worse you can always restore the phone back to factory settings if you have to bring it in.
If you do decide to mod, just make sure you take extra care when doing it to not miss any steps. Read everything on this forum carefully, then make your decision.