well for a first grow you seem to have your shit down man so kudos. Im not a hydro grower and far from experienced so can't really shed to much light on it all, however i would just do your bag seed for now and see how they go. Chances are you will fuck up the grow and maybe even kill them.....so why waste money on good seed?
Others may disagree however i would suggest doing more than one plant. If your going through the hassel of it all you may aswell do a few. One plant or three will still get you in the same amount of shit with the piggies so go for broke. Just my two cents on the matter though.
Also seems how its bagseed there may be a strong chance of hermis or males. So i would personally grow MORE than you need so when it comes to flowering stage you can kull the shit ones. Nothing worse than getting to flower only to find you have hermis...had that problem last year on my first grow.
I have never got seed into the country so can't speak from experience but i hear its better to stay away from the Dutch based banks as it is more likely to be checked by customs than say if you ordered from the UK.
Wish you luck mate and look forward to seeing your grow. Don't forget to start a thread so we can all have a sticky beak