Support SD card, Stock Update, Partition Query

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http://androidforums.com – hello please help me.. I've rooted my WFS recently. 1. I wanna upgrade the external memory to 8 GB, so... what will be the best Class I should choose? I guess MicroSD Class 10 SDHC (Sandisk) will be just fine, isn't it? Is it compatible? 2. Since, I've a rooted device.. I've another partition on my current MicroSD card which stores data (the LINK2SD thing) So I wanna know, can I just backup that SECOND Partition and transfer it to my newer MicroSD card? and HOW? 3. I'm currently on Stock ROM. Can I still get FOTA from HTC or not? If yes then no problem, if NO then how can I u (General)