My Treo 650 On Cingular

This is my fifth or so Treo, so I'm an experienced user.  I like the size of the phone, the keyboard for typing emails, and that it syncs with Exchange keeping my inbox and calendar up to date.  I wish it worked a little better with Exchange like updating emails that I have replied to on my Treo, so that my other email clients become aware.  I'd say this phone has all the features in a pda phone that I use and want.  Speakerphone, email and calendar support, Bluetooth, conference calling, games, and voice dial.  The problem is the phone just doesn't work well enough.  Like I said this is my fifth or so Treo.  I started with the Treo 600, it had basic pda features, but no Bluetooth.  The 600 was terrible and I had it replaced under the warranty program several times.  My voice calls always had an annoying buzzing sound, the phone reset frequently, it would flat out freeze, and often just wouldn't work.  This very painful when you use a phone as much as I do.  So I was very happy when Cingular shipped me a Treo 650 to replace my 600.  Score, or so I thought.

It turns out the Treo 650 isn't much better, except that it has Bluetooth support.  This phone has similar issues.  It locks up and become unresponsive, it resets, and people often complain that I'm in a wind tunnel when I'm talking to them.  Even when things work right on the phone, they don't work well enough.  For instance the speaker phone, unless the phone is right under my mouth people have a difficult time hearing me.  When I use my Bluetooth headset it only works when I have my phone within two feet of my ear piece.  I can't even put the phone in my pocket and have it work clearly enough.  Then there is the issue of answering the phone with the Bluetooth headset.  I have a Motorola headset, so maybe others are better, but it often won't pick up, so you have to answer the phone on the phone. 

So now I'm left with a choice.  I have about one and half years left on my Cingular plan.  I can't say I'm happy with their service, but I've tried a few of them and none of them are great, so I don't think I'll change this part of my service, but I need to find a phone that works well with Exchange, speakerphone, voice dial (least important), conference calling, and works dependably.  Any suggestions?