Help me...

I want to design a database, where all the data will be in unicode form.
data volume: 75000000 (rows aprx)
three options are reqired for the database.

1. Fast search
2. Clustering
3. Cheap

Please advice me which database should I select. MS SQL/Oracle/MySQL
If possible please advice me, any possible tec to optimized the search.

waiting for any response.

Thank you.
royon