The next-gen probes will be even better. :’)
NASA eyes ion engines for Mars orbiter launching in 2022
http://spaceflightnow.com/2015/03/03/nasa-eyes-ion-engines-for-mars-orbiter-launching-in-2022/
Of the planets besides Earth, Mars has the best prospect for human settlements (with some major provisos of course).
OTOH, the Earth could easily support twice the current population via the refoliation of the Sahara, and connecting the Qattara Depression with the Mediterranean would reduce sea level a scosh, and produce a coooler, wetter climate in Saharan Africa.
Vigilanteman discusses Qattara Depression (Why melting polar ice is not a threat)
http://www.freerepublic.com/focus/f-news/1787143/posts?page=11#11
“About 19,605 km2 of the Qattara Depresssion is below sea level,”
http://www.eoearth.org/view/article/169468/
7,570 sq mi, avg depth -200 ft
https://en.wikipedia.org/wiki/Qattara_Depression
(that’s 286.74 cubic miles capacity; Greenland has an estimated 684,000 cu mi of ice, mostly above sealevel; Antarctica has an estimated 6.36 million cubic miles of ice, some of which is already below sealevel)