I very strongly recommend that you look at job sites and find what qualifications the type of company you are interested in are looking for. There are no "standard" routes into engineering so you need to find what each role / industry requires - they can be very different.
Don't get a Master's degree just to get CEng! You can get CEng by demonstrating that your experience is equivalent to a Master's degree. In any case, you need to consider how valuable CEng actually is: when you are looking at jobs you will notice that very few recognise CEng and I, personally, have never seen one that absolutely requires it.
If you are planning to go into management you are very likely to be better off getting a BEng, get a few years experience, and then try for an MBA. And for most engineering jobs my experience is that you are better getting a BEng but again getting as much experience as possible. But if you want to got into a more specialist engineering role MEng might be the right choice.
Andy Millar CEng MIET CMgr MCMIhttp://www.linkedin.com/in/millarandy
"The aim of argument, or of discussion, should not be victory, but progress." Joseph Joubert