Seekers Armguard Gives a large amount of stats for the price and assuming they have an AD Jungler will reduce the chance you will die from a gank
The early DFG gives more burst damage for lane fighting over the Deathcap
Rushing Hourglass is good against a heavy ad team (ad lane) or if team fights break out early while facing a heavy CC team.
While ahead a Haunting Guise can give a fairly large damage increase with the HP, and will make roaming much more effective.
The Mobility Boots over Sorcerers Shoes is really a personal choice but the Mobility Boots movement speed buff for roaming and getting into a good position to engage a fight from is a big plus. (Mobility Boots in conjunction to Haunting Guise leads to very effective roaming)