We will be there the same week, YAY! Can't wait. This is our second trip to DL. Last year we used Lansky, they were wonderful, and we are using them again this year. The website is www.golansky.com. Their number is 213-291-9635.
If it's just the two of you and you want a shared shuttle, Supershuttle is probably your most economical. We use Disneyland Resort Express, because the adult price includes the kids so it's a bit more. It stops at the official DLR hotels first, then the neighboring hotels.
My daughter and I used Karmel shuttle from LAX to Anaheim (and return trip) just over a week ago. Everything went smoothly.. would definitely use them again in the future!