I'm wondering how powerful the new iMacs are. Would an iMac i7 4-core 3.4GHz (which has hyper-threading, if I understand correctly) beat a Mac Pro (early 2009) 8-core 2.66GHz? Or be about the same? I can't help but wonder if they'll eventually drop the Mac Pro line, so I'm thinking about selling mine while the asking prices are still somewhat decent and switching to an iMac. Also, can external USB 3.0 and Thunderbolt HDs match internal SATA 3Gb/s drives on read/write speeds?