Try transmission, here is a tut for setting it up in the GUI:
I would suggest you need the full XBMC as my experiences with OpenElec seem to have no underlying GUI.
HTH - let us know how you get on!
Pi1 [media]: Updated version Raspberry Pi (B, rev2, 512Mb), Samsung 58" Plasma (PN58C8000YFXZA), 8GB Class 6 SD Card with RaspBMC
Pi2 [webserver?]: Original Raspberry Pi (B, rev1, 256Mb), headless, 4Gb Class 6 SD Card