Good call in passing on the dive.
There are some good wreck courses out there, but they are typically produced by a specific instructor instead of by an agency. This means that, if Instructors 'A' and 'B' both teach through the same agency, then 'A' could very well offer the best wreck course in the world while instructor 'B' could be doing little more than taking your money.
Although there are some hazards present in a wreck that are not present inside a cave, I'd encourage you to look into a Cavern class in order to gain a better understanding of what it takes to dive in the overhead safely.
Before cavern, it's really a good idea to hone your fundamental skills (anti-silt kicking, advanced trim & buoyancy control) in a solid 'intro to technical diving' course. The name of the course - and the thoroughness - will tend to vary by agency.
I expect that you'll find those courses to be a lot of fun! After taking them, you'll also have a better idea whether or not wreck penetration is something you want to pursue.