CoolP wrote on Jul 24^th, 2011 at 7:32pm:

The 757 will get you in and out of everything and will also receive her 4.5 update before the 767. So if you're not too much bound to e. g. the larger appearance of the 767 or the variants there, I'd recommend the 757 first.

Thinking about it you're right. I would recommend the 757 before the 767.