Good compliments on her NEW hand bags & shoes will earn a lot of credit
I like your thinking about selling the 70-200 when 200mm f2 is in consideration. I'm few steps away from that 200mm f2 IS. I'm working on a deal package right now, including 35mm f1.4, 16-35 f4 IS and 200mm f2 IS. The store manager is playing hard-to-get right now(he thinks I want those lenses). I'm trying to keep my cool during negotation(I'm drooling from the inside though ).
I'm starting to lean towards primes in my "old" age... Sure the 24-105 has been a solid option along with the 70-200, but good... just not good enough. I like indisputably great... and I find the primes get me there... I'll probably pick up another 70-200, maybe the f4 is because of its small size and solid performance, but I did like the 70-200 f/2.8L usm... oh geesh... I might as well just keep the 70-200 f/2.8 L is mkii and suck it and up and have some redundancy. Damn you photography!!!
I will say that my camera gear has kept its value a hell of a lot more than my baseball cards from the early 90's.
as for the negotiation... I find that having an alternative vendor really helps to push the deal. Maybe contact Canon Price Watch and see what the "street" price for that package would be... Maybe they will come close or beat the asking price... and then explain that you want to buy from them, and it's not all about the money, but it's something you can get and do now... and lord knows that this isn't the end of the line... and if they want to keep your business, they do have to EARN your business.