Hi Katie. I really love that you are already referring to your stoma as your friend, as having a positive attitude will help you tremendously in the days ahead.
We are just 7 weeks out from having the surgery, and have been using Coloplast Sensura Click 2 piece with the xpro wafer (xpro = extended wear) Our flange also has some light convexity to it, which really makes the stoma sit up nice and proud. Since we have already reached our $2000.00 out of pocket maximum and our $750.00 deductible due to numerous hospital stays this year, our insurance covers all of our supplies at 100%. (whew!)
If you're in the US, most ostomy patients are visited in the hospital by a stoma nurse, and they will most likely order you a starter kit to go home with. My understanding is that most hospitals use the Hollister brand, but that does not mean it works best for everyone. As others have suggested, you should contact the ostomy supply companies to request free samples. That way, if you ever have trouble with the Hollister bags, you will already have the other products available to try, instead of waiting for delivery. I would also request samples of some of the accessories as well, such as barrier wings, adhesive removers, etc. Again, you may never have a need for these products, but it sure would be convenient to already have them at your fingertips should the need arise.
Here is a link to a sticky at the top of the stoma forum, that includes the company names and contact numbers.
http://www.crohnsforum.com/showthread.php?t=42852
I wish you much success with your surgery, and that you have a speedy recovery and get back to enjoying life again. Please keep us posted!