I have a nokia n79 and ipod touch 3g 32gb

remember, the 3gs have a weak battery. An ipod is the best way to enjoy all awesome apps and games from the app store without commiting to one device that may run out of juice with heavy use.

One phone + ipod touch : battery dead, phone still there
One iphone 3gs : battery dead, now what?

Potential counter-arguament : bulky with 2 devices, better have one.
So i argue back : what if the weak battery dies? Morphie juice pack air? 3rd party external battery pack? SAME THING. Theres more bulk.