I have the Shinto full size- although it's pretty much gone at this point from years of heavy use (in the last year I have really scaled back my freelancing for several reasons, most of them personal). Anyway, it has some good lighter pink based shades - sounds like most of your clients are in the MAC range of 15-35? Should fit the bill - I would get the sampler to start to ensure it meets your needs. I love foundation palettes because you can mix and blend shades "on the fly". The Shinto palette has a good diversity of undertones and intensities to work with. It also has the RCMA "porcelain" and "ivory" shades which will be essential for you to use as mixers.
The other thing to consider is that this is a classic oil-based creamy foundation formula. For clients that want "oil-free everything", it may not be something you want to use. Again, you can thin it out, but it's still oil-based. Of course, you likely are aware of this, but just wanted to mention it.
Again, if you've not used it before, definitely do the sampler first.
Not to be overkill on the info here - but I also really like Mehron's concealer wheels. Must be set with powder (like most) but I love the shades and consistency.
OK - sorry for the lengthy post. Hope some of this was helpful.
