I believe GUE Fundamentals to be a good course, though I have not taken it yet.
Another option is to find a TDI instructor and take the combined Advanced Nitrox and Decompression Procedures course. That is the route I went and it was the best scuba course I have taken. A qualified TDI instructor can actually combine AN, DP, and Helitrox all into one course. The Helitrox component should only increase the cost of the course be a very minimal amount, if any.
TDI AN/DP will qualify you to do decompression dives with no time limit on deco, use of up to 100% O2 for deco gas, and a maximum depth of 150'. With Helitrox certification, you can also use up to 20% Helium in your gas.
For 180' wrecks, the next step would be TDI Trimix. That will qualify you for use of multiple deco gases, up to 80% Helium (or thereabouts), and dives to a maximum depth of 200'.
Become a Certified Technical Diver - SDI | TDI | ERDI
If you get there and want to go deeper, TDI Advanced Trimix will teach you how to use hypoxic mixes and qualify you for depths to 330'.
I have not done any training with him yet, but I have gotten some good recommendations for John Baker and plan to do my TDI Trimix course with him this summer. If you don't mind traveling to Lake Jocassee, in SC, his prices are extremely reasonable. Way less expensive than GUE Fundamentals plus Tech 1. Price is certainly not the main priority in tech training. But, if you can get the training you want, from a good instructor, why would you not consider price? Anyway, it's just an option to consider.
Technical Courses