insulation contractor recommendation

[notnatalie.livejournal.com]

There are good energy efficiency home improvement rebates being offered by NStar currently (75% off services up to $2K) and I have a small project, a ceiling insulated, that I'd like done before winter settles in. Does anyone have any recommendations? I can always call and ask if they have the certification if you are unsure about that piece of it. They need certification to process the rebate paperwork.
For some reason NStar doesn't have a list of certified contractors posted on a website - you have to call them and wait for a list to be mailed to your home.
Thank you!