BTC is expensive and fuck and you can't possibly mine them with your current system.
LTC are the new kid and you can mine them, they're less expensive than BTC.
Primecoins are the new child and they're cheap and you can mine them.
However, BTC/LTC can be mined using GPU, primcoins use your CPU.
The problem for me is, NVIDIA, I have a 760 GTX SC, kickass in workload but it sucks when it comes to mining. So, BTC/LTC are out of question, however since Primecoins only use CPU, I have 2600K Oc'ed, my chances are better.
I am currently working on things but you should Google things up, I met someone awesome on Steam and he uses BTC for everything.
I will ask him to talk about it on Totseans or interview him and I will most likely add notes about what you can and cannot do. I am no expert but I learn fast.
In short, it's high time for everyone to jump and pickup the new coins while you can.