I got one of these:
http://www.ebay.ca/itm/6FT-Slimport...DA_Cables_Adapters&hash=item338b30046e&_uhb=1
I specifically got that one because I'd rather have my charging plugin at the BACK of the TV instead of tangled up in the front. Most Slimport adapters have the USB end and the charging end within inches of each other.
I find it works just fine, and the G-Pad will also let you do other stuff while the video is mirrored on the screen (yet another thing the iPad! doesn't do!). The only thing that doesn't work well is charging while plugged into the TV - as it's designed for phone use, it's only a trickle / 500mA charge (if that), which will keep the G-Pad going but won't charge appreciably (or at all) while you're outputting to the TV. Better just to use it only for the TV and keep your regular charger for direct use.
Mark