Thanks for your help.
Well, not getting any answers didn't incite me into looking more in depth in what wrecks would looks like and which one would interest me more, so I don't remember much from my pas researches.
Regarding to tek/rec dives, that pretty much depend on the definitions in your country, its legislation, the kind of wrecks available and of course the cost.
Ideally I prefer diving solo, and do long penetrations. If real penetrations at deeper than 40-45m I prefer trimix, if outside of the wrecks deep air up to 60m. In the 30m-40m+ range, nitrox can be nice. For deeper air dive, o2 for deco is nice. I might do a few deeper dive on trimix, but I'm pretty prudent with a boat/captain/ etc that I don't know except when it has a stellar reputation.