I have conflicting views of a Mars mission...On one hand it would be a monumental achievement, something space exploration has strived for since the beginning...On the other hand the cost, the danger(as of now) and a lack of a true spacecraft, make it not much more than a pipe dream right now.
(Please no Gingrich jokes about my next statement!)The first thing NASA should concentrate on would be a "true" spacecraft, one meant to "stay" in space for long extended periods of time. The second thing would be
(here it comes) a Moon base to launch missions from. This base would have to have the processing ability to produce water, oxygen and fuel from Moon rocks...I know it sounds crazy but the process has been proven on a small scale.
But, in all seriousness, we have a long way to go before anything like this could become a reality...We still can't get over our petty terrestrial issues of religion and politics...

Pipe dreams, it's all pipe dreams...