Expensive but the best there is.
I bought my Note Pro 2 weeks ago from the UK and I also did some research like you for a good cover case for my SGNP.
I must say that I still haven't bought the keyboard cover that I want...Yet (I am saving for the Logitech one), So the Logitech recommendation is only based on my own research.
I am sorry to say that although the Logitech Pro is really expensive, i wouldn't compromise for any other keyboard case there is right now on the market.
For me, the generic bluetooth keyboard is absolutely not an option cause if I already put my money on product that I will want to use on a daily basis, I wouldn't waste it on a keyboard that isn't has the ability to be also the case for my tablet. It just doesn't look good and it isn't comfortable.
So what I did, for now, until I will buy the Logitech keyboard is to buy a simple (not that simple) cover that I highly recommend: The i-Blason Protective Cover.
It's a crazy strong hard cover which gives more weight to to the lite tablet and that gives you a better grip on it.
I can tell you that the material of this cover is very high quality so it looks great, very strong and also has some sort of shock absorbance. Plus, it has a good stand.
So, I thought maybe that could help cause it seems like we'er in the same situation (waiting for a good opportunity to buy the Logitech cover).
I hope you'll get a good buy