funny but professional voicemail greetings

I am from Ireland and its for a Multi national manager or executive. My attorney told me that form her experience it takes 4-6 weeks after approval of the I-140 as the visa numbers are current. Bit apprehensive to give the company as I dont see a need for anyone to know this info??? is it absolutely safe to travel with pending i 485 app with valid h1b stamping with receipt notice and completed fp.?we are kind of confuded whether to plan for the travel...We have not yet received the actual advance parole. i read somwhere that if u leave the country wth pending i 485 but without ap ur appl is considered abandoned.is this true.?..we have the option to change the trip to apr too.In a nutshell is it completely safe to travel on 485 pending appl without ap with valid stamping.?:confused: I wanted to start something good that i can work by my self and not cheating others. Brief History: I am working for a Food Processing company (A) in R&D. Company A was my sponsor for GC. I have been on EAD since Oct 2007 (filed 485 during July-Aug 2007 time period) :) . My I-140 was approved Jan 2007. My GC application was started in Apr 2006 - Perm process. Also, i still have my H1B(Extension) valid until Apr 2010. Company A uses a consulting firm for roughly about 25 - 35% of R&D projects. Reason to change: I believe this opportunity will have a significant change/growth to my career. Questions: :confused: Can i change my job to the consulting firm using EAD? What are the consequences i should expect from USCIS? Does the Consulting company have to get involved with any Immigration fillings? If i decide to work for the consulting firm, i will still be doing the same job for Company A but as a consultant + I will have additional projects with other Food Processing companies. I think labor application job description won't change (Company A to Consulting Firm) and this is where i struggle to understand the rules. Need your thoughts and Advice.