What KIND of database do you have, I mean: what kind of data are there, how many columns are usually in a table (aprox.), do you have large tables (no of rows etc.), how critical is your storage-space (do you can afford some wastage) ... ?
Obviously, the equilibrium is 4K, but your database is almost never "a typical one", no matter who you are...
At least tell us how large do you expect to be your database over 1 month, aver 6 months, and over 1 year. This could be the minimal condition to make a vague recomandation. Though not the most proffesional point of start...