I would.
n8 is a good phone, ios is good but since you are not much into apps it doesn't matter much. The screen would be a great refresh, AMOLED screen on n8 is great and more crispier than 3gs (due to higher ppi). Camera is a huge bonus
also that 3k cash sounds good for a party
How does the battery life compare?? Would you exhange 3gs with n8+2800??