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Card readers are cheap and quite fast, at least much faster than usb syncing. Wifi syncing is also much faster than usb syncing, but wifi cards are considerably more expensive (and you need at least a wireless card for your pc, too, and probably you'd want a wireless router).
As for the battery usage, I guess it depends on what card you have, what sort of things you are doing, and how long you can afford to go between chargings. I have the Socket low power WLAN card, and I can go all morning with the standard battery before I need a recharge. I wouldn't call it heavy use, but I am transferring files and checking the web (aximsite, of course!) regularly during that time.
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