My personal preference is Java. Our team has decided it's not only a great language to use/learn, but a much more marketable skill to advertise.
That being said, there are countless threads like yours on CD. A quick search would have revealed these (to name a few).
http://www.chiefdelphi.com/forums/showthread.php?t=86026&highlight=programming+langu ages
http://www.chiefdelphi.com/forums/showthread.php?t=85982&highlight=programming+langu ages