I am not a number theorist, but when I asked my number theory friends to recommend books, some of them suggested the one by Vanden Eynden.
reviewers on amazon agree vanden eynden is good but think $50+ is too expensive for it. (Of course I got mine free.) Maybe a library has it. The reviewers there also mostly like jones and jones, but several people say jones omits crucial non - intuitive steps from some proofs.
I just finished taking the first quarter of undergrad number theory. We used the book by Shoup which was absolutely terrible.
Late in the quarter I discovered the book by Underwood Dudley which completely cleared up so many things for me; its a damn shame I didnt look at this book earlier in the quarter, woulda made the summer so much easier. Anyway, the book is great and its a dover editions so its also cheap.
I got the Vanden Eynden book yesterday and have started going through it.. It's a wonderful book. I'm very pleased and would recommend it to anyone looking to get into number theory. I get the feeling that once I finish this book I'll be more than aptly prepared for a course in number theory (b/c I am studying this on my own right now) and that I'll be able to move on to more advanced number theory texts and topics. Thanks for the recommendation, mathwonk.