For a reader it doesnt really matter the brand just make sure its a READER/WRITER, not just READER.
Make sure if your PC has USB 2.0, get one that supports USB 2.0 so it will b faster.
Make sure it supports MMC and whatever other cards u have.
Hope my 2cents helped, L8tr.
Oh and as for the cases. NO WAY. The ones on the internet are cheap an flimsy. Most people end up breaking the original case trying to take it off and then when they put in the replacement it is so flimsy and cheap it breaks also and they r stuck. Id say wait a bit for better cases to be made or shop for one in person so u can check out the material.