Which one should i choose? Iphone 5s or a custom pc?

I just lost my lumia when i when for a swim and the phone follows me for a swim too because i forget it was in my pocket at the time.
and i decided to buy a new phone. But at the same time, i was planning to buy a custom pc for me to use for 3D works and art stuff (blender, zbrush, autocad, photoshop and etc)
the pc is like an investment, because maybe i'm going to work for a friend doing graphic stuff and can earn some money. But i'm not sure weather there will be work if i join him. It's like 50/50 chance because both of us are still studying and there's our situation.

while for the phone, i'm planning to get the iphone because it looks nice and the specs is great.

here in my country, the iphone cost $2.4K, while the custom made pc is around @4.5K

which one should i buy?

Well, you shouldn't need that pricey of a custom pc for 3-D stuff. You really shouldn't need a top dollar phone either.iPhones are just wants. You can get a pretty good priced android and a decent pc for those prices anyway. In my opinion, you should get a PC that is good for 3-D stuff for like $800-$900 and then get a cheap phone for now. Then save up and get the iPhone later. Hope this helped.

*** the phone go for the pc imo

WHAT?! You lost your lumia because you forget it was in your pocket when you go for "swimming"? What a waste! You should punch your own face!

I suggest you to buy Sony Xperia Z1 + Apple iMac.

Sony Xperia Z1 - Great android phone + waterproof (just in case you forget again)
Apple iMac - Awesome for 3D works and art stuff.