First, there is absolutely no problem using a 35mm camera for this purpose. The film can be digitized during processing and placed on a cd for your usage. In this day and age magazines big and small request slides for input. Even with my D-100 and S3 pro I use my F-100 and my pentax 67 or 4x5 for commercial work.
Now having said all that there are a number of good DSLR's with non interchangeble lens on the used market. My favorite would be the Olympus E-20, Nikon 5700. The number of point and shoots that would fill the bill and endless. My own opinion any point and shoot with atleast 3 mega pixels will work. You just need to understand the limitations of the tool. If you understand and shoot within the constraints of the tool you use, you will make great photographs assuming you understand exposure, and composition. You get what you pay for. Want more flexibility, pay more money.
Bobby
WolfGrafx Photography