New computer with 1000€

So basically I have 1000€ for a new computer and I live in Finland so prices may be a little bit high here (for example hd 4850 is 172€).
Please tell me what are the best parts I can get with that amount of cash.
I have 19" monitor already but I am going to buy 24" monitor at the end of the year so the new computer has to be good enough for that.

I was thinking about 2x HD 4850 but is that best choice moneywise? And what mobo etc. should I buy for those?
Also should I buy Vista 64bit or 32bit?

I would really appreciate full list of components.
Thank you in advance.

Edit: Thank you moriz. I replaced the image that had some Finnish words with links.
So here's what I have thought about buying:
http://www.newegg.com/Product/Produc...82E16819115037
http://www.newegg.com/Product/Produc...82E16813157131
http://www.newegg.com/Product/Produc...82E16814125224 x2
http://www.newegg.com/Product/Produc...82E16820146731
http://www.newegg.com/Product/Produc...82E16817171016
then just 500 GB HDD, 64bit Vista and DVD burner etc.

Second edit:
Which is better moneywise: 2x HD4850 or HD4870?

Third edit: Just noticed the stickied Guide, thx a lot for it. I've pretty much decided what I am going to buy now.

i can't quite understand the language, but i can tell you that you should get the 64bit version of vista, since you have 4gb of ram. 32bit vista can only address approx. 3.12gb.

2x HD4850 is a very good choice, since you are getting GTX280 performance for 2/3 the price. it's still crossfire however, so it does come with its share of quirkiness.