new job means use of a 5dii, what to do

[Jayson]

You know the 24-105 is a great lens. I don't personally have it but many do. Bryan loves it. You will probably get the stop back in iSO performance going from a 50D to the 5DII, so I wouldn't see the issue in going from the 17-55 to the 24-105. I have the 24-70 and sometimes wish I would have purchased the 24-105 instead because of the range. IS can be compensated by using good technique. Forgot to mention that your 2.8 lens on your 50D with the crop factor is more like an f/4+ on a FF anyway, so DOF wouldn't really be that different.