I don't think it is likely that you will get your 800EB to 1.0 GHz or more, since it is already running at 133 MHz FSB out of the blocks, and 1.0 GHz would be at a FSB of 167 MHz !! But go for it.
Most overclockers get 700-800/100's and bump them to 133 MHz, which is to say, to 933-1066, although most don't get over 1.0 GHz if they are that lucky.