Just wait for the next version. A year is nothing. It'll have all the benefits of the iPhone 4 plus no antenna problem.
I would give credence to the rumours that there may be an iPhone 4.x/5 version in January, not necessarily to put this antenna issue aside for good but to move to multiple models or a 6 month refresh.
Things are massively accelerating in the smartphone world what with the plethora of HTC phones coming out and Android is really stepping up with big improvements (look at 2.2 Froyo which has made I understand huge improvements in battery life and speed for models that run it).