First, you must remember to not forget your wards ^o^

Second, this is a good stuff, but not the stuff you must take, 'cause it depend of your team. So ask them to know what halo-items they'll want ;)

This is also for the summoner's spells, you can take an exhaust, for exemple, if your team want it.

There's some items which are good too, like :

With halo ==>

-Zeke's Herald (A good help for your AD mates, even if they have already lifesteal)

-Soul's Shroud (I hate it, and I think it's a bad deal with the Soraka's E, but someone like it ^^")

-Medaillon of the Iron Solari (A 230-hp-shield which can save your mates, very good against kart's ult)

-Will of the Ancient (If you have a AP top like Rumble, while your mid don't take it, it's helpful)

Also :

-Abyssal scepter ( I think the halo isn't really really effective, but it's helpful against strong-magic-damage-dealer and give a little of AP)

-Frozen Heart (Against strong AD teams, it can reverse the game!! Also when the ennemy have two AD carry. Don't say no, you know it arrives)

-Morello's Evil Tome (Against Mundo, Swain, Warwick, Voli, Fiddle, Olaf, Feeded Carry/Tank ...)

-Athene's Unholy Grail (You'll never be oom ;o And a little of mr)

-Rabaddon's Deathcap (You don't know what take ? It's never bad ! ((AP riven <33)) )