hm, pre-sales sounds to me you will spent more time talking about security than actually doing it. ofcourse sales employee's have to have knowledge of the products they sell, which means they will have some level of technical understanding, but performing for example an security assessment will not happen.
Depending on your goals and experience, landing a job like this could position you in a situation where you are able to grow to your ultimate goal, unless this is it, which i can not imagine because of you being on EH.net. So figure out what options you have within the company which will get you to your goal and base your decision on that. Good luck!
CISSP, CEH, ECSA, OSCP, OSWP
earning my stripes appears to be a road i must travel alone...with a little help of EH.net