I's say as pure, undeveloped names.....all would be <reg fee at this stage
In other words, I don't know who would pay you what you have in them when so many more desirable names lie unregistered.
I'd say out of all of them, symbianapps has the most long term potential.....for the trademark owner...Kind of a slippery slope, IMHO. Again, lot's of better names out their if you dig.
Thanks.
Regarding Symbian I have seen many .com sites and a few of them are well known containing the word "symbian" (there is one big site I don't remember its name right now) so it is safe to say it won' be any problem but let's see.