you can put the price you like
if you really get 35k then yes sell it and get 2600k + Asus P8P67 around 46k, means 11k extra, it is worth, but only if you will run 2600k around 4.5 GHz or above, and if you will run 2600k at 4~4.2 GHz then better to keep your current setup as it can easily work at 4 GHz