I need cell phone advice...

Ok, my current phone no longer can reliably pick up a signal. I’m assuming this is the phone’s fault, and not t-mobile’s, since they’ve always worked for me in all parts of Seattle before. Anyway, I need a new phone. The G1 is out—but I don’t know if it’s worth the hype, though I wouldn’t mind having internet access through it.
What I really want is something that works great as a phone. I tend to use headsets, but it’s hard to get one of those that’s particularly good either. Should I just replace my Samsung T-619? Should I get some old junker off ebay? Should I get rid of my cell phone and just use a home line? Or should I go for the G1?