Congratulations on your good fortune. Apparently things operate a bit differently in Romania - if you can get investors by sending out a business plan, but the result is still a great one.
I would strongly suggest that you get professional advice before completing your deal. It can save you a bunch of pain later.
As to going for more money - remember receiving more money means you are selling more of the company.
Marius, keep in mind that a business plan is map. Your route and therefore your plan may have to be altered by unforseen conditions along the way.
Even though you may want to raise enough for 3 yrs of operation (for example) try to limit yourself to just the 1st or 2nd years funding goals. That way you won`t be stuck with a plan that - in practice - isn`t the most successful.
Treat your investors well. Communicate early and often. Thye will be your biggest supporters and your best source of additional capital.