First of all TTS is a feature only to the 910 and 720. Installing it on a 510 is illegal.
To answer your question regarding the SD cards, yes you can use a 2GB or a 4GB (non-SDHC) card to use on your 510. However, if you choose to go with a 4GB SD card the two brands that work for sure are Transcend and Topram.
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