I have been asked to photograph a small high brow fashion event in a restaurant. I have several concerns, firstly to capture the atmoshere i was hoping not to use the flash ( 430ex) but i know my 50D will be hopeless past 800iso. I'm not experienced at low light indoors and struggle with using the flash and getting well exposed pics. So do i beg/ borrow / buy a 5d2 or a 7d? all my lenses will fit the 7d but only two will fit the 5d2 (50mm 1.4 & 70-200L) I have a 17-55 2.8 which i would probably use in this situation or i could buy the 24-70L and sell the 17-55. Will either be any good at low light high iso?...photos will be used for blog pages and other online promos. I realise i do need to upgrade at some point soon but this event is bringing it forward. My mind is just a sea of indesision! My heart wants the FF but my head cant quite justifiy the need with the 7d being such a good camera.