What a shame QVC don't have some kind of "cheat sheet" so if you like Laura Geller Balance & Brighten in Fair - they tell you the nearest shade for other LG foundations, the different Bare Minerals foundations, Tarte, Mally, Benefit, Becca, YBF etc. It should enable you to start with whatever you currently buy and find suits your skin and see what any other brand's closest match would be. Otherwise, it's an utter minefield - and can work out very expensive.
I'm not in the market for a new foundation, but if I was I'm on the pinkier side these days, and by the sound of things wouldn't be well served by most QVC foundations. QVC don't sell the BM original that is my best match. I suppose if they go for UK bestsellers only, they can get those for BM and Benefit - but if they're relying on what's a best seller in the US, they need to remember that for skintone, we are not exactly like the USA!
It would also help if the guide was more detailed about cool (pink) toned, neutral toned and warm (yellow) toned, regardless of how light or dark the foundation is. In that respect Joan Collins gets a gold star.