Erm, exactly, Flypuppy, they are the range that you and friends have actually spent. They accord pretty much with the amounts people I know spent. If you use actual spends, and cover a range of circumstances (not including the money people lost when companies went bust) there is no need to add in a contingency figure, which is usually used for the difference between ideal and reality. You are basing your figures on reality, not idealised sums, so no contingency is required, except to note that unusual circumstances can increase this.
I managed to live on £4,500 + luxuries for a year while I was on the course, so my minimum figure would be around $41,500 (though I would admit that would be tight and boring!). £3-4,000 can make the difference in peoples decisions in these things, let alone £7,000!
It is entirely possible to finish a CPL and an IR in minimum hours and many do, so although a range must be considered the low end is not unrealistic!
HWD
How much of that is sim time? It is entirely possible to do 43 hours of sim in an IR now, at £150-200 per hour replacing flight time at £200-350 per hour. However most schools prefer to teach with more time in the aircraft, so although they may be able to match the quote they quote for perhaps 25/25 sim/aircraft.
Kempus
That sounds about right. Although staying in one place will save you money it is worth being prepared to move for part of the course. You find out a lot more about places once you are in the system, and may decide the school is not right for the next module.