Hi ON, it might be helpful if you told us what Masteries you prefer or if you're open to changing them as well. If you use FLASH, I'd say push down Rank 2 Boots on your priority list.
Warwick blossoms with Attack Damage. I can't remember if I saw this or not, but Banshee's Veil as a late game Magic Resist item is rarely a bad idea IMO.
Also you may have meant this, but if you don't grab 2 HP pots to start, I'd suggest it so you can grab Golem buff from the start. It takes me 2 HP pots to safely do so with my build, but I'm invested in the Utility tree for around half of my Mastery points.
Good Luck! P.S. Try out Wazzabi's Guide in the forums. It's the best one going that I've seen.