Dear ...
Please allow me to extend my thanks to you for offering me the position of__(type of position)__ with __(Name of Organization)__. This position comes as a welcomed opportunity moving forward in my career. It appears to be at a level that I am comfortable with, yet has elements that would offer me challenge.
While I appreciate this job offer, the proposed remuneration package is further away from my ideal figure than what I had hoped. I believe my experience, education, and work ethics will bring considerable value to this position. Having excess of __(#)__ years __(type)__ experience in the __(type field)__, I understand what it takes to successfully __(briefly explain what the optimum goals is for this position)__.
Ideally, I believe a justifiable salary for the skills I offer would fall more closely in the __($amount to $amount)__ range. Thank you for your consideration of this request. I am confident that this investment in me would be a sound investment for the __(company/organization)__ and look forward to hearing from you soon.
Yours truly,