I would definitely do as griz suggests and start contacting a few places after you have an idea of what you want to do. You'll likely get very different quotes from the places and you can start selecting from there. Some were super cheap, but once we got to the details we quickly realized they weren't what we wanted for our trip although it might work for you. This is where we weeded out other companies, based on quickness and ability to reply and meet our requests. If your experience is like mine, you will soon sort out which companies you would feel comfortable with and those that aren't worth spending any further time on.
As far as carrying gear and getting around, I would suggest at the least hiring a porter or two through a company. They can make your trip much more enjoyable by carrying your heavy boots, ropes, axes, etc. on your way to your climbing destination and really make the experience easier for you overall in getting accomadation in the teahouses, arranging for food, and introducing you to the culture generally. You could find porters at the airport in Lukla when you arrive, people will mob you for business, but I know that Sherpa ShangriLa has arranged to have porters that they know waiting for you there with the price and everything pre-arranged, including permits. I'm sure other companies could do the same. Takes some of the fun out of bargaining at the airport, but I just believe having that set out ahead of time definitely takes some of the worry out of it working out.