To sell or not to sell?

I feel like selling my 4ooD and top up a few hundred more to get the new 500D. Had my 400D for just over a year and it would be even harder to sell later on if i wanted to. The body for the 500D is $1269. Only problem is my current battery grip isn't suitably for the 500D and i would have to get another one. So i guess selling off my body together with the battery grip. Any interested parties? Most probably would think it over tonight and would sell it after my IS module on exploring photography ends in about 2 to 3 weeks time.
shot at, 2:27 PM.