Good points. I am not a native English speaker myself. I am afraid that I will be too upfront. Can you think of any terms or phrases I can use here?
If you focus on the value delivered, know your market (what people are paying your competition), and you can justify your higher-than-competition cost, you should be OK. Then double that, in your mind, because you're probably underselling yourself, and underestimating the cost of an employees time to even research these options [ie even the worst product delivers more value to the corp. than a continued search for a product.]
http://www.kalzumeus.com/2012/01/23/salary-negotiation/
I suspect you can glean some applicable information for your situation.