I have no idea what you have in Europe, so my opinion will be from stuff found here. You make do
. You can go all out and spend unlimited amount of money, or just go the way any normal person with a budget would. So this is just what you would normally find on the streets here.
I would go LS motor (B-series NON-VTEC motor). You dont have to, but for an insurance, i would get it resleeved and possibly bored to 2.0. Here in the states, that can run you up to 1000-1500. Can't go wrong with Eagle Rods and Endyn Roller Wave pistons. There is your built bottom end. I would use Crower turbo cams (Skunk2 I believe is coming with some soon), but expect to wait 2-3 months. Port N Polish head, Skunk2 head kit, Skunk2 IM, Bigger TB, 3" Thermal exhaust (or whatever 3" you want.. i like Thermal). You can go Hondata, I personally would. I would use the LS tranny. Its geared longer and better for boost, but I hear that the GSR is even a good choice. Get LSD! Goto
www.ks-motorsports.com and you can custom build you a badass turbo kit. Prebuilt kits = ghey.
I'm sure i'm missing shit, but you get the idea. You can always replace everything with aftermarket. My list was just what is needed.
Since you have a b16. I would do everything above, except get the LS motor. Use your b16 and either port n polish the head out (500-800 here), or get a JDM ITR head with no cams for 700-750. I would still get a different tranny, but i'm sure you can make do with the b16 tranny.
Hope that helps.