TOP is awesome!

Yes, SSH is specifically for limit hold'em, but I would suggest it's still a very good read for an over-all poker 'edjamacation'.

I haven't read it yet, but I've heard that 'harrington on hold'em' is a very good NL book.

Also, you should read Doyle Brunson's NL section in SSI or SS2.

I've also heard good things about Sklansky's NL Tourny book, but I can't offer a direct opinion on it yet.