I think the 187 is really really woth getting! I have two and don't regret spending so much on them because they're great - I'm very pale and with a 187 I can apply any powder blush I like and just get a nice, soft flush. Also, it's awesome for shimmery products like MSFs (though I have to say for the natural MSFs it didn't provide enough coverage, probably because their hair is so soft). It's also good for applying cream blushes in a natural manner and yes, also great for liquid foundation and for Studio Fix powder - this has never looked so natural on me when I used any other sponge or brush. Oh, and I think you might need less product using a 187 with your Studio Fix so I'd restrict myself to one of these and get the brush instead of the second
