I would get the Encyclopedia of Recreational Diving and Diving Science.
Diving Science is available at AMAZON
http://www.amazon.com/exec/obidos/t...103-1103005-5159845?v=glance&s=books&n=507846
Encyclopedia is available at most dive shops in book and cd format.
The other suggestion is determine where you are going to take the tech courses and purchase the books as soon as possible. Spend a little time each week working on them. Use your instructor to be to answer questions.
Personally, I would strongly recommend the Basic, Advanced EANx courses offered by IANTD dive shops. I would also recommend taking the deep diver course alongside the Advanced EANx course. Later on, the IANTD Normoxic Trimix and Gas Blending courses are very cool!
The IANTD courses are extremely comprehensive. The books are informative but not the best written. The more time you can spend with them the better you will understand them.
Once you get through the basic physics there are lots of books on Decompression Theory, Diving Physiology and Technical Diving. However, you may want to consider getting some non-technical diving books like "Last Dive" or "Shadow Divers" to get a good feel for tech divers' passions.
Lastly, I found getting in better shape was essential for my tech diving skills. I would start some rudimentary weight training and definitely some cardio training.
Hope this helps!
Big Jay:
I plan on eventually taking a Tech Diving course in the near future. For now, can you guys/girls reccomend any good reads on an introduction to tech diving (doubles, isolation manifolds, decompression, etc.)? Perhaps a good introductory book before i go take the course. I tend to feel more comfortable about taking courses and more confident if i go in with a bit of education.