Junglers and First Base Buying
What does a jungler ideally buy when he makes for his first base?
Obviously, one of the primary things is the respective "other" jungle item - the XP boost is too sweet to pass up, and most junglers still auto-attack some to benefit from 
/have AoE skills or mana to use 
.
However, I do not think that you necessarily need to get Stalker's/Skirmisher's/Tracker's immediately. Rather, you could think about what item in the equivalent price range (300-400 gold) gives you the most immediate benefit for the next few minutes. That early, you should not be restricted by item slots, anyway.
For example, AD-scaling junglers can get 
for faster clears and a bit of PvP power. The same is true for AS-based junglers with 
. If you absolutely need the sustain, you can go for 
. Or get 
to get around the map at a higher speed.
alone and the sustain gets better and better... The only reason to get Hunter's Potion would be if you want to stay on the jungle forever after the first back but normally there are quite a few moments when you want to back even at full hp just to get the items.