Which programming language to learn?

[phobia]

Up till now I've been a self though PHP programmer, with all the good and bad that comes with that.

I want to expand my horizon by learning a new language, and was hoping some of you here could enlighten me with some good alternatives.

I want to continue with web development, and I guess a typical application would be a CMS, with database integration and all that.

I've been thinking of C#, Java, Python and Ruby On Rails. Any of these you would recommend, or are there some other I should concider too?

I know this is a bit broad topic, but any insights would be greatly appreciated!

[ThatThatGuy]

Since you want to go in web development....

And your'e interested in .Net Technologies too... then you must go for ASP.Net with C#... thats high in demand ... and added up with the a bit of silverlight that's a boom

[Hydaral]

Yeah, ASP.net / C# seems to be the one all the companies want now.

[Jyoti Ballabh]

start with C. What are your preferences, would you rather be in for service-based or product-based environment? There are many factors which come into play.