which bluethooth keyboard to get

Hi Guys I am debating whether or not to get a bluetooth keyboard. The current one I have is really difficult to use as there are no markings to use, plus it is landscape and I find it hard to use with out using both hands. I was wondering if there are any keyboards for the iDevices that are portrait and have the F and J keys marked, or atleast some markings to enable someone to orientate themselves. Any Advice/help would be much appreciated:-)....