Dvoretsky's book aren't absolutely for a player of your level. They are recommended for a player who is at least at master level.
If I had to buy one book ..

I recently bought 'Pawn Power in Chess' at the recommendation of an IM. It is written by a guy called Hans Kmoch.
I haven't read it yet, only skimmed through, but it looks like it may be useful when I get round to it.

I recently bought 'Pawn Power in Chess' at the recommendation of an IM. It is written by a guy called Hans Kmoch.
I haven't read it yet, only skimmed through, but it looks like it may be useful when I get round to it.
it's a good book. i have it. but again, very subtle and for advanced players.

A few ideas for you:
My 60 Memorable Games
Silman's Endgame Course (if you don't have a suitable endgame book)
Something on rook endgames if you need that focus
Pawn Struture Chess by GM Andrew Soltis

If you have all of those, and I mean no offense by this, your rating tells me you will improve more by spending your time reading them instead of your money buying more. Those books have enough information in them to get you to USCF expert -easily- (combined with tactics and practice), which roughly (very roughly, there's no good comparison) translates to 2100-2200+ chess.com online rating.
I haven't found many other books that worthwhile, personally.
If I had to buy one book which should it be.
I already have books like my system, fred reinfeld's 1001 brilliant sacrifices and checkmates, informant's chess combination anthology, all of dvoretsky's books etc..
which book should i for.