What is the best CAD programme/package for my company?

I am currently using AutoCAD but feel I am limited of what I can produce.

I work for a process pipework company where we specialise in the food industry however we do supply pipework for other industries too.

we have the requirement to produce large 3D models of large pipework systems from surveys whilst also producing smaller drawings of single spools and other components in 2D and 3D,

what programme/package would you recommend for us to have?

Thanks