First off O.W. to Tech in one year is wrong. But this is MY OPINION. If you are going on this path or just looking to buy good equipment you can grow into, follow this advice.
1.) Go to EBAY. I cannot tell you how much tech equipment I buy off ebay. So many divers try tech diving and do not like it. You can buy great equipment there.Others up grade and sell there used stuff in great condition.
2.) Join a tech e-mail list in your area (if you don't know any, email me and I will send you some) You can get very good equipment on these lists and meet divers in the area and if you are looking to learn they are willing to teach. They will tell you the same as I and if you dive with them they will limit your diving to a safe level until you show them you are ready to move on.
3.)As for Regs these buy new. Scuba-pro, Posiden, Sherwood,what ever the brand do a lot of research. Look at the divers WHO ARE DIVING in the area you wish to dive (ie:tech, cave, wreck). Ask many questions.
Do you want side exhaust vs. bottom. adjustible vs. non- adjustible,etc.
4.)Dive, dive, dive, a hundred dives is not enough to start hitting agressive technical dives. (A technical dive is not just depth.)
5.)Know your tables cold. Use bottom timers. Computer do not work at 300ft on a mix.
6.)and be ready to spend a lot of money.
If you like I can share a story on a simple tri-mix to 200 fsw where a similar person spent who spent 6 months in traning from ow to tri-mix and almost drowned in a very simple emergency.(And I lost a 7,500 dollar camera and housing too saving her ass!!!!)