I would wait at the moment. Most of the top end phones are about to be replaced (at least I know this for Nokia and SE).
The N96 is going to replace the N95 and will have DVB-T [Freeview] TV, whereas SE have finally learned to spell and are replacing the K850i with the C902i [Although, it doesn't seem like much of an upgrade - the camera is still 5MP - but if it comes out in any colour other than Red it'd look pretty neat].
My dad has a Samsung, I've never really liked them all that much. Also the F490 is pretty much just a major rip-off of the LG Viewty.
I have seen the N95, and it's quite bulky but then it does have a lot of features under the hood.
I've got a K850i, they seem to have fixed the problem with the buttons sticking or whatever (although this problem never happened to me with my previous SE phones), but the firmware for them is still slightly buggy.