Best Chess Tactics book for 1500 player?

Hi, I would greatly appreciate it if some knowledgeable players can write in and tell me what would be the best tactics book for me to increase my rating.  I already own Seirawan's winning chess tactics and Judit Polgar's Chess tactics for champions.  Currently I'm looking at Richard Palliser's The complete chess workout or Reinfield's 1001 winning sacrifices and combos.  Any suggestions would be greatly appreciated.

I second chesstempo.com.  It's an amazing site!

I'll get you the link to Coach Heisman's recommended book list:

http://danheisman.home.comcast.net/~danheisman/Events_Books/General_Book_Guide.htm#DvoretskyTacticsSet

It's great for pattern recognition but for more involved sacrifices and combinations you'll need a good book.  I'd recommend Muller's (of Secrets of Pawn Endings and Fundamental Chess Endings fame) Magic of Chess Tactics for 1500.  A book would give context to the tactics and help bring the relevent positions up on the board. 

Wrong Polgar Susan is the author if you have her book you don't need another to explain tactics fundamentals she knows what's she's doing your in good hands.

To improve your vision solve problems a hell of alot of them mates 1 2 3 4 5 6 7 combinations in bunches again and again through your minds eye without moving any pieces on a chess set or on a computer even solving 35-40 minutes a day helps. Some people immediate improvement in their game after solving for only a couple of weeks others see a big improvement after 6-9 months of consistent effort everyone is different.

1001 Winning Chess Sacrifices Combinations by Fred Reinfeld

http://www.amazon.com/1001-Winning-Chess-Sacrifices-Combinations/dp/0879801115/?ie=UTF8&qid=1387762788&sr=8-2&keywords=1000+chess+combinations

1000 Brilliant Ways to Checkmate by Reinfeld:

http://www.amazon.com/Brilliant-Checkmate-Chess-lovers-library/dp/0879801107/?ie=UTF8&qid=1387762867&sr=8-1&keywords=1001+checkmate

Play through game collections full of minatures like this one again and again backwards and forwards time yourself with a chess clock:

http://www.amazon.com/1000-Best-Short-Games-Chess/dp/4871875741/?ie=UTF8&qid=1387761884&sr=8-1&keywords=1000+best+short+games+of+chess

I've gotten a lot of use out of Combination Challenge! by Lou Hayes and John Hall.

Back to Basics: Tactics by Dan Heisman

If you already owned and studied Seirawan and Polgar's tactics books, why not buy a difficult tactics books like "The Great Book of Chess Combinations" by Joszef Pinter or Encyclopedia (Anthology) of Chess Combinations?