I would recommend leaving your request in the wanted section and agents with properties of your liking will contact you directly. You can also try to contact a few agents from the agents section.
Regarding your query about average rent for a 2 bed apartment in JLT. Well it can vary depending on the type of building you opt for, however as of March 2010 the average rent would be in the range of 80K to 120K depending on location, view, apartment size etc.