go to university or learn .net technology?

Question

Hi,
I worked as a .net programmer for more than 5.5 years in my own country.
I will work in usa starting from July,2010. This job does not belong to IT field. I want to be employed as a .net programmer again in the future. So I need to take my leisure time to upgrade my computer knowledge. I have two ways to do that.
One way is that I will take my leisure two or three years to go to university for achieving a master degree majoring in computer science.
Another way is that I will take my leisure one year to finish learning these technology: C#,ADO.NET,Windows Forms,ASP.NET,ASP.NET MVC,ASP.NET MVC2,Javascript,JQuery,ASP.NET Ajax,LINQ,XML/XPATH/XSLT,CSS/HTML/XHTML/DHTML,Photoshop/Flash/Dreamweaver,SQL,Data Structure. (Is one year enough? )

Which way is smarter? May you give me some suggestion?

Thanks.