What is a good book for a second "course" in group theory?

Having studied some group theory in my last term at university, I've found it to be quite interesting, although it's also something I want to improve on (mainly when it comes to proving statements), so I figured that it might be worth doing some group theory slightly beyond what I need for this year, just to get a better feel for the topic in general.

However, when I've had a look around, the only good group theory books I've found seem to be those in the "Graduate Texts in Mathematics" series (for example Robinson's "A Course in the Theory of Groups") and therefore probably slightly too advanced for a first year. So, would anyone please be able to suggest a good book for self-studying first/second year group theory?

EDIT: from your response below your answer: I'd definitely check out Rotman's text. That's the text I'd recommend most highly.

Original post:

Look into Joseph Rotman's An Introduction to the Theory of Groups: that would be a good continuation from your initial semester studying group theory. (You can preview the book at the given link.)

(EDIT: what follows seems no longer to be relevant, as noted at the start of my answer, but may be a quick read/review, nonetheless.)

(in original post) If previewing the text looks too advanced, check out the Dover (hence inexpensive!) book by John Rose: A Course on Group Theory. That should bridge the gaps from initial exposure to group theory, and a more advanced text in group theory. (You can "preview" the book at the given link.)

See the classical Joseph Rotman An Introduction to the Theory of Groups.

See too Introduction to Group Theory by Oleg Vladimirovič Bogopolʹskij.