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The Desire S can take the 64GB MicroSD cards and I know a couple of people with the Sandisk 64GB microSDs in their phones.
I've used two 32GB Sandisk MicroSDs (a class 4 and a class 6) and both work flawlessly. A class 2 might be fine for your needs, but a class 4 will be more than adequate to cover everything the Desire S can do.
I've stuck to Sandisk as I've never had a problem with them. They work in all the devices I have that use an SD card. That can't be said for some manufacturers like Kingston which can be fussy about what device they're used with.
Beware buying cheap cards - and even standard priced cards - on eBay, Amazon, etc. There are a huge number of fakes about.