I'd say LISP family via SICP book. Almost zero syntax, multiparadigm (i.e. ain't force you to do something in a strict way), lots of high level stuff, extendabl

I'd say LISP family via SICP book. Almost zero syntax, multiparadigm (i.e. ain't force you to do something in a strict way), lots of high level stuff, extendable. Once you'll learn Lisp - you won't care in which programming language to code at all, since it covers all of the ground. Another variant is Rebol and Red, with them you could start tinkering with GUIs in no time, in other aspects it's similar to Lisp, Forth and Ruby.