Well, since no one has replied, I'll mention two readers (with the caveat that since I am a novice you should check with others):
Although Longus wrote in Attic Greek, he did write in the 2nd century AD (or thereabouts), so his Greek is not 100% standard Attic. This text can be partially viewed on Amazon, and there is a fair amount of help with vocabulary and grammar. Maybe this can help you.
Longus' Daphnis & Chloe
http://www.amazon.com/Longus-Daphnis-Ch ... 165&sr=8-1
I recognize some of Longus in "A Greek Boy At Home".
I have not used this Anabasis reader, but it is on my list, and perhaps is worthy of your attention. It has commentary and vocabulary. Again, Amazon lets you partially view this book, though less than the case of Longus above.
http://www.amazon.com/Xenophons-Anabasi ... 015&sr=8-1
Maybe others can suggest easy readers with vocabulary and commentary- though this is jumping ahead a bit in my case, others could benefit.
ἀλλ' ἔγωγε ἐξ αὐτῶν τούτων μᾶλλον αὐτὸν τεθαύμακα, ὅτι ἔν τε ἀλλοκότοις καὶ ἐν ἐξαισίοις πράγμασι αὐτός τε διεγένετο καὶ τὴν ἀρχὴν διεσώσατο. Dio LXXII 36.3