ok if you are fine with your psu right now you dont need to upgrade yet. almost all fans have pass through connectors. which means that it does not take another molex plug. as for lights i would reccomend some led case fans and get some cold cathode lights from newegg.http://www.newegg.com/Product/Product.asp?Item=N82E16800888070
something like that would work.
I've had those in my old PC, they are very bright. One more thing you need to keep in mind is that the on/off switch needs to take an empty card slot; so make sure there is at least one open space in your case.
And the 4 pin molex connector is a pass through, so it wont need dedicated power from the PSU, just run it through the hard drive power cable.