I have already stated this will likely be my wife's next phone if the camera can perform well and as shown in this Pocket-lint review it looks quite good. Aaron also has a hands-on video of the HTC Radar 4G over on PhoneDog.com so check that out too.
I will be at Nokia World this week and will get to see the new Nokia Windows Phone devices that will be announced. I hope at least one comes to T-Mobile USA, but if not then the HTC Radar 4G is a good candidate to consider. My only hesitation is the limited, and non-expandable, 8GB memory since I have 32GB in both my HTC HD7 and Dell Venue Pro and really can't go with anything less than 16GB.