I for one won't suggest any of Silman's books. Until the OP learns to not drop pieces left and right, Silman's books are useless to him.
In Post #15 of this recent thread, http://www.chess.com/forum/view/general/help-im-going-downhill , I made two suggestions. The OP stated that he'd work on Suggestion 1 but said nothing about working on Suggestion 2. My mistake was in making two suggestions. Suggestion 2 was critically important; Suggestion 1 was of minor importance.
So my recommendation to the OP is to work on Suggestion 2. The OP will never get any better until he does so. (I know, these are harsh words, but I think they're necessary.)
OK, I'm a nobody, and why should the OP pay any attention to my suggestion? Fair enough.
I really think at this point the OP would be better off to contact Dan Heisman and pay for a single lesson from Dan. Yes, it won't be cheap, but I feel confident that Dan could help him address the piece-dropping issue. Of course, I'm fairly confident that Dan will just reiterate what I suggested, but at least it would be coming from a renowned chess instructor.
A few weeks ago I posted saying over several years my rating has slipped on this site from over 1600 down to a little over 1400. I was all set to enter some tournaments until I realized I'd proabablu make the same mistakes again.
So I have decided to take a month or more off and read or re read some books.
Any suggestions? Please don't suggest My System. I ave tried that book and found it too hard.