a99 vs. mklll

I have been using a700 for 5 years. Had invested in few lenses like sal70200g, sigma 2470 f2.8, old minolta 50mm f1.7 and a flash 42am. I think this is a time to replace the camera, I am looking at a99 or Canon MKlll.  My biggest complain with a700 is the noise and general image quality in low lighting like indoors. I live in Alaska and we don't much sunny bright days, so before I invest in cz lenses any suggestions if it is a time to switch over to Canon?