Sorry, I'm only able to tell you the experiences I had four years ago. Beyond that, I'd hesitate to advise, as I do not have the expertise nor the experience of the current market.
Overall costs for comparison are useful in terms of sheer spend, but does not take account of cash flow available to you over that period. E.g. cost for comparison is of course lower for a ten year mortgage than it is for a twenty year one.
I have been told from a few mortgage providers that getting lots of prices for a mortgage will harm my credit rating, do you know if this is true?
Very unlikely, but would anyone have said just a couple of years ago that interest rates will be at an historic all time low of 0.5% for quite a while? No. They've been relatively stable since 93 but were in the double digits in the early 90's.So if interest rates went up above 5.9% the bank would start loosing money on your mortgage, but again do you see interest rates going above 5.9%?