I made a high level gondor wizard way back and I can say I had alot of fun playing it.
Leveling that character wasn't too difficult and ones it reached 40 it could really support a party in raids like MM or even Barad Dur.
Think of a mass haste cast by a lvl 35 wizard or Mindblank or any of those nice spells to strengthen a group.
Also Interposing hands are quite usefull.
And then the old Horrids still come in handy in certain area's to clean up the road ahead.
I see them mainly as a utility build. If you go wizard you can easily adjust to certain situation by changing spells.
I'm making a mordor variant atm, but have focused him around the abjuration school to see if the new updates on spells from this school are if anything usefull to have.
Buy a volume from the cheap merchant who sells the ressurection chains.
There are alot of updates summarized in there. Maybe something will catch yer eyes
Good luck building that uber wizard!