Metin,

>If you are doing that with as a software firm (It can be small, no problem) best is Microsoft Empower. It's about 400-USD. You will have 1 MSDN subscribing and 5 user with that. All Microsoft product will on your hand.

Yes, Empower seems to be a good deal.

>But it's for one year only. After that Microsoft want you be a Microsoft partner.

It started out originally as a one-year-only agreement, but they have now added the option to renew it for one more year. You have to commit to announce on your website the product you are developing (within 18 months of original signup).