Awesome long term buffs

[Meredith Nerissa]

I'm looking for beneficial spells with a long duration for my 10th-level sorcerer--things that I wouldn't normally have access to, but could cast thanks to paragon surge.

[Cory Stafford 29]

Off the top of my head it would be the 1hr/lvl ones like mage armmor, magic vestment, and greater magic weapon/fang.

[MatthewN]

Also look at some of the 10 min per level buffs. They can last a significant amount of time, especially if you can extend them.