Hi!
..interesting, I see paralles to myself.
I am 1,92m & 85kg, have been riding for quite some years, after it came to a stop for 5-6 years. Last spring came the 'relaunch' of this amazing hobby for me... with the same considerations. And btw: I have been without an own board for some time, renting boards for my skiing holidays until they weren't available for renting any more.... and I liked the Oxygene boards very much that time!!
But on your post:
First of all you should think about the width of the boards. There are the narrow boards with less than 19cm waist, requiring high binding angles to avoid overhang of your boots (and that's a must!). And there are the wider boards, like the ones built by SWOARD or PUREBOARDING, roughly 23+cm waist. The riding style and feeling is different. You certainly find pages of ergonomy philisophy & and pro and con, but I personally think at this point the stomach does the decision. Continue where you feel more comfortable. (For me the wider boards!)
When it comes to riding effort and power, I would like to cite Jörg Egli from Pureboarding: 'Raceboards almost killed our sport'. They are stiff and physically demanding, taking everything from you and yes, they return it through their performance. But you need to be a fulltime sportsman or accept spending the afternoons at the ski-bar for recovery.
Alpine boarding without exhausing will be an unrealistic promise! Few manufactureres have fortunately realised that alpine snowboard carvig is more than raceboarding. Those modern alpine carving boards offer a much better fun to effort ratio. And: do I want to race every piste with top speed and min time? Nooooo, I want to enjoy, feel the ride thorough the turns!
An advise you will find very often: join a carving session. In many cases a hand full of manufactureres are present and offer advise & testing. Plus, as I have recognised last autum: a great community of people entirely crazy for alpine carving, and really open arms for us newbies...
BR, Christian