hi guys.. first post here.. i have a 20" 2.4ghz intel core 2 duo imac, 4gb ram, ATI,RadeonHD2600 (256mb VRAM), 1tb HD etc etc. i was considering attaching another LCD/Monitor to the mac.. basically powering two screens with the imac. i know its possible, but wanted to know if it will in any way slow the mac down and/or does it have any disadvantages or problems? Are the spec on this mac good enough to power another screen, with relationg to the display/resolution/images etc..?? any help or advice on the topic will be appriciated! thanks!!