Level 35 Ghost Putter - this will hold till atleast 70.
Get 2 or 3 of the high mid-high thirties cleveland wedges, if you can afford to dish out for a third, ditch the hybrid club for the third wedge. I use the 56,60,64 and I like it. These wedges will hold till 85.
Get the level 30 (I think) taylormade R11 3 wood, another poster elaborated on why it is beneficial.
For irons, you want high launch irons, not Medium/high like the starters. The reason high launch irons are important is because they impact the green at a much steeper trajectory and make the ball stick better and not role. You should wait till the level 59 Ping G25s for first iron purchase to save $$.
Driver wise, but the level R11 three wood and use it as both a driver and 3 wood until you reach the level 48 driver. It's the best till the higher tier levels.