GC Filing in EB2 Category - possible without Masters Degree?

[h1_To_GC]

Here is my case followed by few questions.
-I have done my Bachelors of Engineering in Information Technology in 2005.
-Having total five and a half years (at the time of writting this) of experience as Software Engineer / software Consultant.
-I was in the USA on L1 Visa from April 2008 to Nov 2009.
-Later, I entered in the States on H1 Visa in March, 2010 and my H1 is valid till Dec, 2012 followed by one extension of duration about 3.5 years.
-My primary skills include Asp.Net, C#.Net, SharePoint and Silverlight technologies.
-My salary is above 70,000 $

Questions
-Can my company(Existing H1 sponsering firm) file my Green Card in EB2 category ?
-Can another company (other than one who sponsered my H1) file for my Green Card under EB2 category - under Future Based Employement ?
-Can I file for my Green Card with help of attorny firm - this might be a silly question but want to take a chance ?
-If answers to above questions are/is NO then what all is required for me to qualify for EB2 category ?

Answer/guidance will be greatly appreciated.

Thank you.

[txh1b]

All are possible if the job requires one to have 5 years of exp plus a Bachelors.

You cannot file a GC yourself.